In Progress

Esp12 in Server AP Mode with Push Notification


I'm currently using an esp07-slave triggered by events that sends a message to the esp12-master. The esp12 then directs the ardunio to turn-off a solenoid & sends push notification to the app. The arduino also supports an HC-05 module linked to the android app. The simple app can open or close the solenoid. Arduino also uses a manual push button momentary switch to open or close the solenoid.

Objectives: Simplification

This project is to simplify the earlier project without losing any of the functionality. This projects will eliminate the arduino, and the HC-05 bt. Instead use the esp12 in server mode & the esp01 & android device in client mode to perform the same tasks as BLE.

1). Would need to plug the arduino code into the esp12 to control the solenoid & enable the esp12 server mode, The esp01 & app as client modes. See screen shot of how the code might be written for a server/client mode.

2). Enable the Esp12 to send & display temperature to my app. Make any necessary mods to the app temp page so the readings are displayed correctly. Trigger the solenoid closed at 32*F or 0*C temp reading.

Flow chart: Description (attached)

Master’s IP (assigned by the router, statically or dynamically (DHCP) is configured into slaves code so that slave can send data to master over GET request.

Master would connect to router to send data (Push Notification) to web, from web to android app. Slave pings to master’s IP to send GET request, and receives ECHO payload that contains the necessary data (active polling method).

Summary: 1. Client posts data to master , 2. Client retrieves acknowledgment after posting data to server-esp12, 3. Server-esp12 creates AP that client connects to, 4. Server-esp12 connects to router to send push notification to hosted web server, back to android 5. No internet access needed from router, for client, server or app talk. Intranet connected.

Brief description: (esp01- Client function)

Esp01 if triggered sends message to esp12 server to close solenoid & send push notification message. Green led is (ON) when client is in triggered state. When client is out of triggered state led is (OFF). When client is powered up the first time green led blinks (3) times.

Brief description: (esp12- Server function)

The server esp12 when triggered by the client closes the solenoid and sends push notification to android device. The esp12 can open or close the solenoid by momentary switch. Push once to close, Push again to open solenoid. This event also sends the push notification. The app can open or close the solenoid. The esp12 temp reading can trigger the solenoid closed & send push notification. When solenoid is closed red led is (ON). When solenoid is open green led is (ON), red led is (OFF). When esp12 receives message from esp01 Green led blinks (5) times. When esp12 is powered up for the first time green led blinks (3) times, then all led's are off.

Hardware components:


1. esp01

2. led

3. Trigger switch- 2 wire probes


1. esp12

2. 2 leds (Indicates if solenoid is open/closed by LED color)

3. Reset Switch

4. H-bridge > Solenoid

5. Temp sensor DS18B20

Attached flow chart.


Should be able to demonstrate by short video clip that the esp01 communicates with the esp12 as described. Will provide the arduino/esp12-master/slave files formatted to open/close solenoid from earlier project.

The budget for this project is $125usd. Time frame 3-6 days.

Skills: Android, Arduino, C Programming, Embedded Software, Full Stack Development

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About the Employer:
( 2 reviews ) St. Pete, United States

Project ID: #20277455

Awarded to:


Hello automation engineer here! Let’s keep the good work! I’m gonna writte random stuff here cuz proposal has a minimum request letters

$124 USD in 3 days
(2 Reviews)

11 freelancers are bidding on average $256 for this job


Hi there I am an electrical engineer with 8+ years of experience with wifi modules especially esp8266. I can implement the required functionality that you want. Let me know if you are interested.

$350 USD in 7 days
(17 Reviews)

Dear sir I have read requirements of your project with great care and I am very interested. I think that I am the right person for the job. I am a Android and Firebase, Web(PHP, Javascript) Backend Expert and have ful More

$250 USD in 7 days
(8 Reviews)

Hello My name is Maria, Im an electronic engineer with a lot of experience in Esp12 projects. I am very professional doing my job and I would like to know more about your requeriments to be part of your project. I will More

$250 USD in 7 days
(8 Reviews)

We are a team of Electrical and Electronics engineers and we are Excellent in the following areas: • Embedded C Programming. • VHDL/Verilog • Microcontroller like Arduino, Raspberry Pi, FPGA, AVR, PIC and STM32. • ID More

$140 USD in 7 days
(17 Reviews)

Hello, I have worked with Arduino projects for nine years. With the different versions of the ESP micro-controller for five years. In addition to the basic features of Arduino and ESP, i.e, monitoring of digital and More

$225 USD in 12 days
(4 Reviews)

for more information you can view my profile. well experienced in Arduino, STM, Nordic, Texas, Raspberry Pi, Olimex, ESP and other.

$200 USD in 10 days
(5 Reviews)

Hello If both master and slave ESPs are connected to the router , they can communicate with MQTT If not ,"because the picture suggests they're not " .. the only way is ESP-NOW protocol , still this will imply complex More

$350 USD in 10 days
(2 Reviews)

Hello We have been an engineer for more than 8 years in the market and have already developed projects for several companies using microcontrollers like ARM, PIC, AVR, NXP, Nordic, Texas, STM, ESP, Arduino, Raspberry More

$250 USD in 10 days
(2 Reviews)

Hi, Push notification need third party service (internet connection), how about ESP12 as MQTT server and both the android app and client ESP01 both connect to it to interact with the ESP12 Regarding solenoid, Push on More

$125 USD in 5 days
(1 Review)

Hi I am Andoid and IOS APPs expert having 7+ years experience and ready to Esp12 in Server AP Mode with Push Notification. Kindly initiate the chat to discuss further on the same. Please check my Android AP More

$555 USD in 20 days
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