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Author: bill

MicroPython & ULP/RTC Memory

MicroPython & ULP/RTC Memory

Big power advantages exist for using the ULP ( Ultra Low Power ) processor for regular tasks like recording a state change from a GPIO or ADC input, storing the information within the RTC memory, then waking the main CPU up when the information needs to be transmitted via Lora.… Read More

e-Bike Lithium Ion Load Tester

e-Bike Lithium Ion Load Tester

Using power resistors is not feasable, but AC halogen bulbs are easily sources up to 500W , so multiple bulbs can be used to vary the current

500bulb watts
28.8bulb resistance
52battery voltage

So on a 52V battery pack a 500w halogen bulb would draw about 1.8Amps

Voltage can be monitored with a simple voltage divider to lower the 52V to something suitable ( < 3v probably )

Current can be monitored with a shunt

30A FL-2 DC 75mV Current Shunt Resistor for Ammeter Amperemeter Panel Meter

This instructables guide would be a good starting point

Could be better to stick with one technology AKA PyCom
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Lora Modules

Lora Modules


Murata’s CMWX1ZZABZ (STM32L082 and SX1276)


Grasshopper LoRa/LoRaWAN Development Board
STM32L082 Development Board with SX1276 LoRa Radio programmable using Arduino IDE via USB Connector

RAK811 868Mhz LoRa LoRaWAN Module
Standard original RAK Wireless RAK811 LoRaWAN module.… Read More