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…...........................--- HandCab Wiring Schematics ---

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Above is the main wiring diagrams . I would print it out and use it for the color coding of the wiring. It will make wiring a lot easier if you follow what I've done above and what you will see in the build. Will save a lot of confusion. Notice that I used 5 wire colors the ones in one of the two choices of colors for the wires I've recommended. I used a black magic marker on some to stripe them for easy identification during the build.

If it is hard to print the image above here is a link to it alone ( Image HERE ). If that doesn't work the following link is to a pdf file of the image that you can blow up and also should be easy to print ( Image HERE ).

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Next are some different wiring options for batteries and charging:

Above is the wiring diagram for one battery with an On/Off switch between it and the battery. Also the option to add a $6.00 3 stage charging board so you can charge with the ESP32 off. There is also an optional On/Off indicator LED.

Above is the wiring diagram for two batteries with an On/Off switch between them and the battery. A DPDT center off toggle switch has been added along with indicator LEDs. The switch allows a center off or the choice to power the ESP32 from either battery and is also use to direct charging to the appropriate battery.

Previously in the build I showed briefly the option to add a $6.00 3 stage charging board so you can charge with the ESP32 off.

The WEMOS Lolin32 Lite ESP32 is capable of charging the battery/batteries but I like using the Adafruit 3 stage LiPo battery charger. It only cost $6 and is available from Adafruit or DigiKey. It comes setup as a 100mA charger but if your battery is over 500mAh you can solder across the 2 part pad at the bottom and it will charge at 500 mA per hour. Since both of the batteries I'll use are quite a bit over 500mAh I solder across the gap for the higher charging rate.

I can't find out much about the Lolin32 Lite's battery charging circuit but don't imagine it is as good at the Adafruit one. Also to use it the ESP32 has to be connected to a USB charging (5v) cord and the ESP32 itself is turned on while charging. I like the fact that for a few dollars more using their charger the ESP32 can be off except when you are using the throttle.

For the whole build of this throttle go ( HERE ).

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