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Frequently Asked Questions

This page contains the most frequently questions from user. If this page's detail can't solve your problem, you can also talk in our forum: community.heltec.cn

Can't Download Firmware​

  • Use a better USB cable, or change a USB socket.
  • Check and make sure the CP210x drive had been correctly installed, users can refer to this document: Establish Serial Connection.
  • Press "PRG" button before upload.

Another Communication Bus Usage Example​

System Reset All the Time​

According to the situation we have collected so far, the most likely to cause a constant reset problem may have two reasons:

  • Power supply problem: please make sure the voltage of USB ≥ 4.7V, 300mA.
  • You chose an error board: because each type of board may have a different FLASH size, and they have a different partition map, it will cause the internal logic error.

Node to node communication​

On the premise of no hardware problem, LoRa nodes can communicate with each other node-to-node. The key to success node-to-node communication need make sure the following 7 points the same:

  1. The same sending and listening frequency: LoRa.setFrequency(frequency)
  2. The same bandwidth: LoRa.setSignalBandwidth(signalBandwidth)
  3. The same coding rate: LoRa.setCodingRate4(codingRateDenominator)
  4. The same preamble length: LoRa.setPreambleLength(preambleLength)
  5. The same sync word: LoRa.setSyncWord(syncWord)
  6. The status of LORA_IQ_INVERSION is the same
  7. the same SPREADING FACTOR

Know more information about LoRa node-to-node communication, please refer to LoRa basic library APIs: https://github.com/HelTecAutomation/Heltec_ESP32/blob/master/src/lora/API.md