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robomakery / pvc-powerchair

Open-source, low-cost, pediatric powerchair
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Battery level indicator - research #41

Closed dylanvaughn closed 7 years ago

dylanvaughn commented 7 years ago

Research battery level indicator attached to arduino.

When battery is low, turn on LED.

dylanvaughn commented 7 years ago

Assign to Rob once Dylan gets his github username.

rbeetem commented 7 years ago

github user name rbeetem

rbeetem commented 7 years ago

Basically a voltage divider. Two known value resistors fed to Arduino analog input. Arduino input is 0-5v, 10 bit resolution.

Implementation Example: http://henrysbench.capnfatz.com/henrys-bench/arduino-voltage-measurements/arduino-25v-voltage-sensor-module-user-manual/

Add logic for LEDs in Arduino code.

TODO: number of LEDs desired? (1 red) or (1 red and 1 green) or (1 red, 1 yellow, 1 green) or anything else.

dylanvaughn commented 7 years ago

Need to identify parts and add to the BOM and drawing

dylanvaughn commented 7 years ago

Let's go with a OLED display:

https://www.google.com/search?q=oled+64x32&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiRorjnyarUAhUrxVQKHWkBB4gQ_AUIBigB&biw=1600&bih=1097#imgrc=_