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

LSN50 -Waterproof Long Range Wireless LoRa Sensor Nodedwmzone.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/ ( 3.5uA ) github.com/HelTecAutomation/ASR650x-Arduino/blob/master/PinoutDiagram/HTCC-AM01.pdf github.com/HelTecAutomation/ASR650x-Arduino ESP32-PICO + SX1276 module heltec.org/project/wireless-stick-lite/ ( 30uA ) heltec.org/project/wireless-shell/ ( 10uA ) docs.heltec.cn/download/wireless_shell_reference_hardware_design.pdf github.com/Heltec-Aaron-Lee/WiFi_Kit_series/files/3469714/Sleep.test.Panda.Board.txt www.aliexpress.com/item/33030551325.html github.com/Heltec-Aaron-Lee/WiFi_Kit_series/tree/master/esp32/libraries/ESP32/examples/DeepSleep/ExternalWakeUp TTGO 868MHz/915MHz SX1276 ESP32 LoRa 0.96 Inch Blue OLED Display Bluetooth WIFI Lora Kit 32 Module IOT Board for Arduinowww.aliexpress.com/item/32840258107.html MicroPython firmware port with lots includedgithub.com/loboris/MicroPython_ESP32_psRAM_LoBo/wiki github.com/aizukanne/ESP32-micropython-lora github.com/mallagant/uLoRaWAN github.com/pycom/pycom-micropython-sigfox www.hackster.io/search?i=projects&q=lorawan

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. The programming of the ULP can now be done via a simple MicroPython wrapper: github.com/ThomasWaldmann/py-esp32-ulp/ github.com/micropython/micropython/pull/3578 ULP examples github.com/espressif/esp-iot-solution/tree/master/examples/ulp_examples LoBo MicroPython for ESP32github.com/loboris/MicroPython_ESP32_psRAM_LoBo/wiki/rtcgithub.com/loboris/MicroPython_ESP32_psRAM_LoBo/wiki adds RTC.read and RTC.write NB: Still looking…

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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…

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