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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

120Vrms
500bulb watts
28.8bulb resistance
52battery voltage
93.88889watts
1.805556amps

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

www.ebay.co.uk/i/362323528806

www.ebay.co.uk/itm/Lamp-Holder-R7s-117mm-118mm-Linear-Halogen-160-500W-Halogen-Lampholder-/321935501041

www.amazon.co.uk/J118mm-Tungsten-Halogen-floodlight-security/dp/B004HDVS20

This instructables guide would be a good starting point
www.instructables.com/id/Li-ion-Capacity-Tester-/

Could be better to stick with one technology AKA PyCom
docs.pycom.io/datasheets/oem/l04/
github.com/maddog75/LoPyI2CLCD
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Lora Modules

Lora Modules

www.thethingsnetwork.org/forum/t/which-module-has-the-lowest-sleep-current/15622

……

Murata’s CMWX1ZZABZ (STM32L082 and SX1276)
github.com/kriswiner/CMWX1ZZABZ

hackaday.io/project/35169-hackable-cmwx1zzabz-lora-devices

wireless.murata.com/type-abz.html


shop.sodaq.com/868-915-mhz-lora-lorawan-module.html

EMB-LR1272

Grasshopper LoRa/LoRaWAN Development Board
www.tindie.com/products/tleracorp/grasshopper-loralorawan-development-board/
£32
STM32L082 Development Board with SX1276 LoRa Radio programmable using Arduino IDE via USB Connector

RAK811 868Mhz LoRa LoRaWAN Module
www.rakwireless.com/en/module/lora/RAK811
downloads.rakwireless.com/en/LoRa/RAK811/Hardware_Specification/RAK811_LoRa_Module_Datasheet_V1.4.pdf
www.tindie.com/products/kilobyte/rak811-868mhz-lora-lorawan-module/
£17
Standard original RAK Wireless RAK811 LoRaWAN module.… Read More