Billus – Tech Blog

www.dragino.com/products/lora/item/149-lora-gps-hat.html

Features:

• Support Raspberry Pi 3B/3B+/4
• Up to -142.5dBm sensitivity with SX1257 Tx/Rx front-end
• 70 dB CW interferer rejection at 1 MHz offset
• Able to operate with negative SNR, CCR up to 9dB
• Emulates 49x LoRa demodulators and 1x (G)FSK demodulator
• Dual digital TX&RX radio front-end interfaces
• 10 programmable parallel demodulation paths
• Dynamic data-rate (DDR) adaptation
• GPS Module to provide timestamp and location info

… Read More

LSN50 -Waterproof Long Range Wireless LoRa Sensor Node
dwmzone.com/en/dragino/536-1604-lsn50-waterproof-long-range-wireless-lora-sensor-node.html#/22-center_frequency-868mhz

Heltec

ASR650x-based ( ARM® Cortex M0+ Core and SX1262 )
heltec.org/project/htcc-ab01/ ( 3.5uA )
heltec.org/project/htcc-am01/… Read More

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

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

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

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

www.ebay.co.uk/i/362323528806… Read More