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I would like a 4 digit, LCD timer module with a magnetic reed switch. This module including batteries must be as cheap as possible.
Please see attached design files. I have more. If this design can be improved I am enthusiastic to hear your ideas.
These design files were created for an LCD model GDC8310 as per the parts list. However I require this design to be modified for a smaller LCD GDC0209. PCB will need redesign. Hopefully you can help me.
The LCD will be provided to you and will have a diffuser. 12 o'clock LCD.
The switch is a 10mm magnetic reed switch (AO) and is securely connected to the back of the module by a 200mm wire (white sheath) with the reed switch at the furtherest point.
The PCB dimension: length 50mm x width 25mm x depth 30mm. PCB can be deeper/shallower as your design requires. PCB can be longer/shorter as your design requires. Width may not be. The width is very important and must be as narrow as possible.
The PCB will require imbedded white LEDs to illuminate the LCD via the diffuser.
The LCD will be positioned at the lowest edge of the PCB. LEDs preferred to be above the LCD to enable positioning to be as close to lowest edge of PCB as possible. Unsure of quantity of LEDs as power consumption is a concern.
The LCD will be in operation in an ambiently lit indoor room.
When the reed switch is activated the timer LCD screen lights up and counts up in seconds (max 99.99 seconds- ss:th). Accuracy is not important. +-5% is ok. Whole second digits are only visible when counted (I don't want "00.01", the visible digits must be " .01").
Once the timer is deactivated the time continues to be displayed for ~20 seconds. After 20 seconds the power shuts off and the screen goes blank. Upon activation it resets and begins counting up again from .01. If the timer is interrupted while the LCD is in operation (either counting or displaying the previous count) the module resets and begins counting up again from .01. The timer must enable this interruption.
I will provide firmware for this, to be confirmed in your design.
For example the reed switch has a magnet placed near it, causing it to close. The timer then activates and starts counting up from .01. As the timer is counting the magnet moves away, causing the reed switch to open and break the circuit. The timer pauses counting and displays the time for 20.00 seconds. After 20secs the timer powers down, waiting for the magnet to pass the reed switch again. If the magnet passes the reed switch at any time during the 20sec display time, the timer will begin counting from .01.
This timer needs 14 hours of operation time. Standby time should be as long as possible (months).
I would like you to provide me with 15 examples of this timer, as well as all supporting documentation. The supporting documentation will be complete and will enable manufacture with no uncertainties. If your design and prototypes are suitable in cost and quality I will definitely be interested in a reliable and scalable supplier relationship.
I will provide you with LCDs and diffusers.
I am happy to release a milestone payment after agreement of design and components, with full payment upon receipt of prototypes. Your bid must include delivery costs to Sydney, Australia. Good luck guys.