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Wei1234c / SX127x_driver_for_MicroPython_on_ESP8266

SX127x (LoRa transceiver) driver for (Micro)Python on ESP8266/ESP32/Raspberry_Pi
GNU General Public License v3.0
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TTGO range and data rate #2

Closed carterw closed 6 years ago

carterw commented 6 years ago

Wei1234c thanks very much for your excellent repository of code here and also the reference material! Very impressive work.

We are discussing the sx127x driver code in this thread on the Micropython forum, you may be interested in it.

Seeing as how you have code that references the TTGO modules, have you experimented with them? I am curious to know what distances and data rates can be expected.

Wei1234c commented 6 years ago

Glad that it is useful to you.

As for the TTGO ESP32+LoRa+OLED module, I have used it in some experiments but not in field test of long range.

I think that there are mainly two problems of TTGO module:

  1. Hardware reset sometimes cause problem: I think TTGO module has bad reset circuit so that the SPI sometimes doesn't work properly after hardware reset. Everything works fine after software reset though. This only happened to TTGO module, my other ESP32 modules work just fine with SX1278 modules..
  2. Power consumption: If you set transmitting power level high for the SX1278, it will require as much as 120mA. The tiny on-board regulator IC may not be able to supply it along with the consumption of other components on the development board.
carterw commented 6 years ago

The default transmit power level is 2. Is that the highest? I have tried powering with a lipo battery, which probably bypasses the regulator, and not seeing any difference.

Wei1234c commented 6 years ago

The pwr_level can go up to 17. I am not sure about LIPO, which I didn't use.

Also, you may want to try setting the LowDataRateOptimize flag, please see issue #1.

carterw commented 6 years ago

Adjusting the power level to 17 made a big improvement in the range, thanks.