LoPy

Objective

Our aim is to test the lora signal for LoPy micro-controller with different bandwidths. We performed both for line-of-sight test and the test with obstacles (buildings and trees). The test is the outdoor test with good weather condition. The test with bad weather condition will be our future work.

Testing Scenarios

Two LoPy micro-controllers are used. One sends a signal and other waits for a signal before replying back. The random sleep is used to avoid jamming at nodes, which can cause the packet lost. For all the tests, one node acts as stationary node while another moves with the human-walking speed. The test stops when both nodes do not receive signal and the distance is calculated.

Line-of-sight experiment

• medium range: bandwidth=LoRa.BW_250KHZ,coding_rate=LoRa.CODING_4_5,sf=7
  • To be determined
• fast short range: bandwidth=LoRa.BW_500KHZ,coding_rate=LoRa.CODING_4_5,sf=7
  • According to our experiment, the signal can be received upto 400 m.
• slow long range: bandwidth=LoRa.BW_125KHZ,coding_rate=LoRa.CODING_4_8,sf=9
  • It does not work
• very slow long range: bandwidth=LoRa.BW_125KHZ,coding_rate=LoRa.CODING_4_8,sf=12
  • It does not work

Building and trees experiment

• medium range: bandwidth=LoRa.BW_250KHZ,coding_rate=LoRa.CODING_4_5,sf=7
  • According to our experiment, the signal can be received upto 200 m.
• fast short range: bandwidth=LoRa.BW_500KHZ,coding_rate=LoRa.CODING_4_5,sf=7
  • According to our experiment, the signal can be received upto 150 m.
• slow long range: bandwidth=LoRa.BW_125KHZ,coding_rate=LoRa.CODING_4_8,sf=9
  • It does not work
• very slow long range: bandwidth=LoRa.BW_125KHZ,coding_rate=LoRa.CODING_4_8,sf=12
  • It does not work