Measure of Assistance Given by SUGG Electric Bike

I want to know how much my assisted SUGG bike help me.

The only solution i think is to measure the current from the battery.

Happily, the connectors are standard (XT60E) , so it is easy to put a sensor in the power line.

So: current sensor, converter, and display showing

Percent of full power and percent delta power
Thermometer style percent
Measured current, computed power
Autoshutdown with displayed time to off and last x seconds 'thermo' and numeric display countdown.
Demo mode ..

The shutdown is done when delta between max and min usage drop below a preset value ( std 0.5 A) for more than 'TimeOutmills'

The mean of current is updated every 'DampingDurmills' ms.

In addition, the 37V converter give 2 USB ports.

WARNING: I burn two converter, on by short-circuit (my fault) but the other simply when charging my smartphone: It seems that the 'Thermal shutdown and current-limit protection' on the LM2596 is not efficient.

So it is probably better to not use USB outputs.

Contact me for more informations.

Supplies

Current sensor hall effect :

https://www.gotronic.fr/art-capteur-de-courant-12-5-a-mr392-25747.htm

XT60E connectors:

https://www.aliexpress.com/item/1005007526349818.html

OLED 128x64 SSD1306:

https://www.aliexpress.com/item/32896971385.html

NodeMCU esp8266 (with CP2102)

https://www.aliexpress.com/item/33053690164.html

DC6..40V to 2 x USB :

https://www.aliexpress.com/item/1005008854445547.html

.stl for SSD1306 displaycase for handle bar:

https://github.com/openbikesensor/OpenBikeSensor3dPrintableCase/tree/main/export/Mounting

( As the handlebar display from the OBS project fit perfectly the function, i re-use it )

Step 1: Schematics

The schematic is really straigforward, the SSD1303 is directly connected to the NodeMCU, and the A0 is used to get the analog measure from the current sensor.

I put a selection entry jumper and potentiometer on the board to be able to check the circuit on the bench.

The circuit is cabled on a proto board. Yes, i need to increase my drawings skills ...