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Electronic and Electrical system designs

Username: EEmbedded

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Location: Colombo, Sri Lanka

Member since: July 2009



(14 reviews)

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1 user has recommended this freelancer.

My projects:

  • $444.00 USD
    Profile image for Seller cardcod


    Mar 14, 2014

    I have worked with other freelancers , but this guy is a real professional and an expert, I will work with this professional freelancer again.. Thank you.

    Project Description:I am looking for someone to design and build a stand alone device what will record key sequences on 4x4 matrice. Key sequences will be time stamp saved when is press enter key or after a period of times of inactivity...
  • $390.50 USD
    Profile image for Seller craves1


    Sep 28, 2013

    This was an Infrared to HID keyboard projectI got the Receiver design within hours after I hired him.We were able to debug the design and he wrote the firmware within one day of finishing the prototype. EEmbedded consistently was able to complete all tasks that were necessary to get the prototype working quickly and easily with only minor delays to re-write and test the code.The project was finished on budget and without any delays on EEnbedded’s part.I have been working with software and electronic engineers for more than 20 years and I find him to be just a good or better than the best. I have worked with some great engineers worldwide so that is saying a lot.I have already awarded him another project and will surely award more in the future.Great work!!!

    Project Description:Looking for a developer to write code for a RS232 to USB HID Keyboard. The Device will be designed around a low pin count Microchip Microprocessor. The input to this device will be infrared by way of a Infrared to serial receiver decoder micro...
  • £388.00 GBP
    Profile image for Seller WigglyAmps


    Sep 14, 2013

    Our first experience on Freelancer and very happy with the results. They actually *read* the requirements (unlike some bidders!) and delivered what we wanted before the deadline. Good communication and Language skills - would not hesitate to use again.

    Project Description:We require someone with experience of the Teensy 3 ( to build a simple, custom HID project. Requirements are: - Device presents itself as custom HID (Not fussed...
  • $250.00 USD
    Profile image for Seller jiggawatteng


    Mar 24, 2013

    Great work, good communication, worked well to overcome problems. will hire again!

    Project Description:I need a Rapid Fire assembly code written to use with a 14 pin PIC MCU and installed on an xbox 360 "Common Ground" controller. The code will have 7 Main modes with 18 Sub-modes total. This will only use buttons and connections already on the xbox controller...
  • [Sealed]
    Profile image for Seller banjotoenails

    banjotoenails [ Incomplete Report ]

    Feb 22, 2013

    This Freelancer had great communiction, but did no work. Many assurances were given from him but it only served to delay the project. Accurate requirements were given by me from the outset so the delay was not caused by requirement clarification. Simply put, he promised something, could not deliver, and drew out the project time significantly with false updates. Would not recommend.

    Project Description:I would like a 4 digit, LCD timer module with a magnetic reed switch. This module including batteries must be as cheap as possible. I require this design to be modified for a smaller LCD GDC0209. PCB will need redesign...
  • $70.55 USD
    Profile image for Seller chrisellwood


    Dec 11, 2011

    10 = Excellent. This guy is 10!

    Project Description:I am looking for a competent software / firmware developer who has good development experience to help me with the following... As shown in the picture below I have a basic interface board built upon the PIC18F4550...
  • $90.00 USD
    Profile image for Seller chrisellwood


    Dec 3, 2011

    Rating: 5.0/5.0

    Project Description:[Project Description hidden]
  • $0.00 USD
    Profile image for Seller cleoglass

    cleoglass [ Incomplete Report ]

    Aug 26, 2011

    Eeprasad (the worker) agreed in their Worker Contract that if their project went into arbitration, they would respond to the arbitrator's questions fully and on a timely basis, or they would forfeit the arbitration. An arbitration occurred and eeprasad did not do this. All funds in escrow were returned to renting_goodcoders (the employer).

    Project Description:[Project Description hidden]
  • $133.20 USD
    Profile image for Seller reddy889


    Dec 14, 2010

    Rating: 5.0/5.0

    Project Description:[Project Description hidden]
  • $127.50 USD
    Profile image for Seller chrisellwood


    Dec 9, 2010

    Superb! Excellent Coder, thanks!

    Project Description:Please see pictures and files relating to this project at The PCB is a simple interface board that is designed to write hardware position data to Microsoft Flight Simulator X and also read data from the same application...
    EEmbedded has not completed any projects.
  • [Sealed] In Progress

    Background InformationPreviously we had another person building these portable incubators for us that was a retired electrical engineer. He suddenly passed away and we have been unable to get any of the intellectual property concerning the incubators from the estate While we still have many working units that are still operational we do know in the future that we will eventually need more units therefore we are embarking on this project to design our own incubator with help from some talented individual or team from Freelancer. Initial Requirements for Version 3Here is what we are trying to achieve:PCB should not be bulky or interfere with portability of the unitPower Source: (2) 9 volt alkaline batteriesSome kind of on/off switchVolume of Water to be Heated: 100 mlWater Temperature Starting Point: 80 °FOptimal Temperature Point: 98.6 °FOptimal Temperature Range 95 to 99 °FTime at Optimal Temp: 3.33 Hours Other Notes: Liquid should never go over 100 °F and once it reaches 95 °F it should not deviate below that temperature.The basic parts consist of the following: 1 PVC bag1 metal sensor probe that is inserted in the bag.1 sensor that is inserted in the probe and connected to a controller board.1 flexible heater that fits under the bag and is connected to the controller board2 9 volt battery leads that is connected to the controller board.Software should be written to keep the temperature at the desired range.**** IMPORTANT***Please read the PDF file for more complete information.

  • $300 USD In Progress

    I need a people counter tool prototype to be designed and manufactured.The aim of the tool is to count how many visitors visit a store and record this data over the web in a MYSQL database.- The tool should have 2 sensors to make sure, that bi-directional counting is available.(e.g. The data should be recorded in a MySQL database. Every entry should have a record: Incoming: timestamp;IN Outgoing: timestamp;OUTNo housing, no beautiful case is required, just really the frame wired, but working tool.Write in your application how you would connect the Arduino Board or the Raspberry (or why would you use just one of them), otherwise your application will be ignored.Battery or AC powered are both options. (Battery preferred for prototype)

  • $444 USD In Progress

    I need a LED controller that has 9 outputs. six of which are for controlling red, blue and green LED"s to create different colors. The other three will be for single white LEDs that can be adjusted to any level. The three white led output must have independent memory for brightness levels and return to the last state when power is applied. The two color changing channel should also have independent memory so they also returned to the color they were adjusted to last.The dimming level for the white LED"s should be more than 16 steps.The color channels should also dim in a minimum of 16 stepsThe color of the 2 color changing channels should be adjusted by independent buttons on a remote control. There are also 4 keys per color changing channels that are memories for those channels that will return to the preset channels. The white LED channels will have three button each that will return them to three different brightness preset levels. These brightness levels are set into memory by a store key that is pressed and held until the LED on that channel flashes then the button to store the level in is pushed.There will also be 2 flashing rates for each channel ( 2 color changing channels and 3 white LED channels) controlled by independent buttons on the remote control. This will need 6 buttons to accomplish.Layout and SoftwareThe micro this should be designed around will be a Microchip part.The memory can be internal or externalA schematic is required so we can make the PCBThe firmware source code should be well documented and complied with the MPLAB from microchip. Remote controlNo need to design a remote control.The LED micro will be controlled be a 8 pin serial micro from Microchip. It will take care of all the remote control button decoding and present the key codes to the LED controller Micro as 4 byte ASCII data starting with the $.The data will be defined as a "new key press" and a "repeats same key press" and "key number". The LED controller firmware must have a mapping table where we can decide what remote control code controls what LED function.We have many designs with this layout already so it is not complicated. We just change the key mapping and re-compile the code then program the micro. The Micro for the controller should be a Flash type for in-circuit programming.There should be a port to program the micro using MPLAB and a IDC2 programmer or similar. LED drive circuit and voltage.The circuit will be 12 volts with a 5 volt regulator for the micros. We can finish the design from the outputs of the LED controller"s Microprocessor.

  • $90 USD In Progress

    Xbee Sensor Project The Xbee will communicate with my pc using a Serial (RS232) or USB port. It is necessary to design this hardware ( I know that maybe Arduino can do this or some other kit). I need to use 2 Xbee to communicate with each other in order to send and receive info on some sensors that could be used with home automation. The idea is that the temperature sensor detects if it"s necessary to turn on the A/C or not and then it turns it ON and when not necessary any more, it turns the A/C OFF. Both Xbees need to receive AND send signals to be programmed and to program the other. For example, I want to set new temperature parameters for the sensor to turn ON the air: Instead of 30 Celsius, it should turn the A/C when the temperature reaches 25. I also need to read from the other Xbee the temperature on that exactly moment. ## DeliverablesIt is also necessary to build and test it if it works. Please include all harware schematics and necessary components.

  • $3333 USD Today

    Wi-Fi embedded device(wi-fi additional module)General:Goal of this project is develop wi-fi and ethernet device (additional wi-fi module) for water leak protection system. It is bridge, which translate information from system to web-server and translate information from web-server to system. Interface of connection-UART.Power:Power supply: 3 battery type “C”, Voltage -4,5V or DC power supplier 5V.What we need:PCB Layot, Programm code, device, which working good.All future details by private talking

  • $833 USD Today

    The project consist :1) create the arduino sketch with all the comunications library etc etc 2) php site where to control the sensors and save data in the sql database3) create a small apps ios and android that can manage the sensors as the website The project is quite simple and most of the informations components and code are already made .

  • $1111 USD 2 days ago

    Based on your profile, we have noticed that you have strong competency for Micro-controller and Bluetooth.We think you will be a great fit for our project, which involve a hardware and firmware design of a device that intended to be controlled by a mobile phone (android and iOS). The project will require a very secure approach for pairing method, proximity detection, and need for 2 way communication between the mobile phone and the hardware. No worry the app will be taken care of by another mobile developer which should make your life easier.Let us know if you are still available and willing to take on new project. If you so what would be the best time to have a quick chat.Details on the firmware/hardware will be discussed later in private messages.Hope hearing from you soon

  • R7777 ZAR 2 days ago

    I need Thermoelectric Peltier Cooler circuit with a temperature controller and a temperature sensor. These coolers need a heatsink on the hot side otherwise they blow. I need the heatsink to be as flat as possible I basically need the cool side of the Peltier to maintain water at a specific temperature even if the water temperature goes up due to external factors. I want a price for 2 options. 1. A physical hardware controller that maintains temprature according to a temprature switch or a bluetooth controlled system via android.

  • $1250 USD 3 days ago

    We need a person who will be able to program our PCB

  • $1555 USD 5 days ago

    I need someone to create a small accessory that vibrates at a variety of speeds off of commands that can be given from great distances. Not sure if it would be via an app, or how this can be done. Both aspects would need to be wireless.

  • ₹200000 INR 5 days ago

    I am looking for someone with high experience in GSM/GPRS and SMS data transmission. I need the qualified bidder to build a GSM Magnetic Stripe Card Reader. After the card has been swiped, the data has to be sent via the GSM module to a phone number of my choice. Also most importantly the reader must be able to read interrupted swipes. (If the card is swiped half way and then back out and then forward in a fast,slow or jitter motion), the magnetic reader can still read the data from the card. It also must have a long life rechargeable li-ion battery. The device is required to be portable, so the PCB is required to be as small as possible. Thankyou.

  • $255 USD 7 days ago

    I need you modify an ibeacon firmware that i found online for the cc2540... we will discuss everything later but im willing to pay just 30 usd... jsut for experienced users

  • $444 USD 9 days ago

    Need: I require a USB device that accepts usb input device, and allows me to remap specific keys to a different characters.Example: When a user types the 5 key, the 5 key will output a "j" in the user"s operating system.Usage Case: I can plug in a usb numpad, and remap specific keys to different characters. Software packages do exists that have this functionality, but I want a hardware solution. Working Example: Here is a link to a forum topic which contains instructions for the device I need: http:// need a service provider with experience building teensy hardware components to build (or show me a comparable product) a usb to usb keyboard remapping device. Steps: I will select SPI will release initial milestone funds to SP for purchasing components SP will purchase components SP will build and test deviceSP will ship finished hardware to me. I will release remaining funds Skills required: Be able to complete task based on forum post. Be able to solder and complete arduino/teensy usb devicePlease Note: I created this posting because I have searched extensively for a suitable product, but did not find any devices that matched my requirement.If you have encountered an existing device that fulfills my requirements, let me know. I will accept you as the provider and compensate you for the referral.Summary:Need usb to usb keyboard remapping deviceI will pay for partsNeed SP to assemble them. Let me know if this exists.

  • £166 GBP 9 days ago

    I"ve build a circuit for LEDs, testing it out several times, also uding the codes we"ve made. But the system doesn"t work when running it to the actual LED, it overheats and crashes the boards.

  • $1000 USD 16 days ago

    design and develop prototype to adapt to my Thrustpac, low voltage permanent magnet/ generator coil system to light the thrustpac for night time user safety. 8 to 10 red LEDs illuminate to sides and rearward for safety/visibility. A battery should maintain light intensity while propeller/ magnetic disc are not rotating at engine Idle condition.

  • $1333 USD 23 days ago

    We need a complete PCB design for an innovative computer mouse called “The bean”. The PCB has to fit into the given dimension of The bean.The PCB has to include the following functions:- Optical sensor- Right click- Left click- Scroll ( performed by a touch sensor not a mechanical wheel)- Middle clickThe job consists of designing the PCB including all the needed electronic components (Sensor, IC, Resistors…) and the references of these components (Supplier, price range) by supplying a BOM.The main challenge of this work is to find the suitable touch-sensor that will perform the following functions:- Scroll up- Scroll down- ClickAnd integrate it to the PCB with the suitable IC.

  • $1777 CAD 23 days ago

    The scope of this project is to connect X number of machines with a master , through an WiFi access pointA master CPU will send request to each machine on the network (a string of 5 bytes)It will start from first address x.x.x.1 to the last one x.x.x.254Each of the slave will reply with a string of 5 bytes.After the last address, 254, the master will start again from first address.As it is not know what machines are in the network, the master have to send request to the entire 254 range. The IP address is assigned manually at each machine.Your task is to take care of communicationWhen data to be sent out is ready , a bit will be set to let you know that a 5 bytes string has to be sent out.When data is received from WiFi controller, a bit should be high to let me know i have new data to read.The other way is to store the data to be sent on eeprom , and you will take it from there, and store new data received on eeprom also at receiving address.Also you should provide a way to monitor sent data and received data on a laptop which monitor traffic.The topology and suggested hardware are on the attached files.For language, i prefer MikoBasic from Mikroelectronika.

  • $2222 CAD 25 days ago

    I am looking to create a prototype for a game-controller (similar to console controllers) that works with the PC. Some elements of the controller are: analogue stick, analogue-triggers, multiple buttons, touch-screen, track-ball, and spin-wheel. The device would have to be wireless (2.4Ghz). Power to come from 2 AA batteries. I can provide drawings for the basic layout and form, but not the innards. The touch-screen would be small, in the 2" range. Software to custom program the display will not be necessary initially, but instead it must display and accept some simple "proof of concept" commands.If you are capable of providing a 3D rendering of a "finished" product I would pay extra.The finished project should "work", that is all buttons and functions work together and the controller can be used. However, the finished product does not have to be "polished". (I am looking for a prototype after all). However, I would like diagrams and all relevant information that would be required to complete a "final" product if I hand it off to some qualified individual in the future.I would like at least 2 prototypes made.Please don"t hesitate to contact me if you would like more information.

  • $2000 USD 27 days ago

    this FW imply :- Camera with FSMC and DMA on RAM (same sensor as dev board : OV2640, but in JPEG output mode, VGA or QVGA, all SCCB command available)- Wifi with SN8200 on SPI for raw socket comm (SN8200 driver based on HAL is done, but need debug)- USB raw comm

  • $555 CAD 27 days ago

    Need an idea I came up with made, need 2 prototypes built. Needs to involve RFID. Working prototypes. Needs history in electronics. Complex idea. Ill message you with details.

  • $1666 USD 28 days ago

    Product a device that can be beeped/buzzed with a remote. The buzzer is small,

  • $555 SGD 29 days ago

    To audit and correct the program on our customized machine which is to communicate between motion controller and LCD display. Ensure the LCD display to display the information required for ease of operation

  • $1111 USD Jun 10, 2014

    I require a small program to be written that will be used on a Windows XP-based computer in a **coach**. The principal purpose is as follows: 1/ The coach will drive to various different landmarks. Based on the GPS longitude and latitude of these landmarks, it will trigger a specific video file to play on Windows Media Player. There will be a list of approx 30 Video files to play at differing locations. 2/ For example, when the coach approaches a monument or landmark, the software program will check to see if the GPS longitude and latitude is **equal or similar to** the coordinates associated with the video file. If the coach is in the defined location, the relevant video file will be played.

  • $22 USD/hr Jun 9, 2014

    I"m in need of an android expert that possibly knows something about android"s as well. I"m trying to build this: which is an android app that will turn an LED on and off (and dim) and the LED is connected to the arduino Yun. Should be fairly easy and fast for an skilled developer.

    EEmbedded does not have any open projects.
    EEmbedded does not have any work in progress.
[see more]


[see more]



USB HID Controller

Sep 2013 - Sep 2013 (1 month)


USB HID using Teensy 3 development tool

Magnetic Card Reader

Aug 2013 - Dec 2013 (4 months)

PCB design, <br />Firmware development,<br />Prototype development


BSc (Eng) Honors

University of Moratuwa






Knowledge on heart patients through stethoscopic cardiac murmur identification for E-healthcare


Cardiac murmurs are the sounds produced by the abnormal passage of the blood flow inside the heart due to the diseased valves or tissues. Identifying the type of the murmur can diagnose the cardiac pathology related to that particular murmur. This paper describes a researched digital stethoscope that can be used as a stethoscope as well as a murmur identification device. To capture the heart beat, a chest piece of a traditional stethoscope is used with a condenser microphone attachment. Then the signal is a

Auscultation based stethoscopic diagnostic device for cardiac murmur identification


In a healthy heart, there is no any abnormal blood flow takes place inside, in addition to the usual blood circulating pattern. However when the valves or tissues inside the heart are in diseased conditions, this usual blood flow pattern gets changed. As a result, abnormal sounds are produced with the normal heart beat sound. These abnormal sounds are known as cardiac murmurs. By identifying the murmur type doctors can diagnose the cardiac pathology related to that particular murmur type. This paper describ