EEVblog Electronics Community Forum
Electronics => Beginners => Topic started by: serhiip on January 14, 2023, 10:46:18 am
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Now I detect motion with my Arduino Nano and 3pin (SIGNAL, 5V, GND) motion detector
When detector triggers, I need to send signal (distance at least 5km) to another Arduino Nano and catch it. As far as I understand, 433Mhz is the optimal frequency for this.
Please suggest me what should I use? Which circuit, protocol etc. The solution should be as simple and as cheap as possible
Thank you in advance!
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Even the best LoRa would be a push. Check out GSM / NB-IoT relays.
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Now I detect motion with my Arduino Nano and 3pin (SIGNAL, 5V, GND) motion detector
When detector triggers, I need to send signal (distance at least 5km) to another Arduino Nano and catch it. As far as I understand, 433Mhz is the optimal frequency for this.
Please suggest me what should I use? Which circuit, protocol etc. The solution should be as simple and as cheap as possible
Thank you in advance!
Cheap Chinese modules like in the attachments.
The 4km transmitter I have used LOS 10+km.
Some Ali links:
https://www.aliexpress.com/item/1005004724610649.html?spm=a2g0o.productlist.main.13.37724718BT0wol&algo_pvid=03b6b78f-41f9-4d61-8732-38162bd01aee&algo_exp_id=03b6b78f-41f9-4d61-8732-38162bd01aee-6&pdp_ext_f=%7B%22sku_id%22%3A%2212000030238794363%22%7D&pdp_npi=2%40dis%21USD%215.2%212.55%21%21%21%21%21%4021021b4716737741871477607d0688%2112000030238794363%21sea&curPageLogUid=6gPrMRnkkMAC (https://www.aliexpress.com/item/1005004724610649.html?spm=a2g0o.productlist.main.13.37724718BT0wol&algo_pvid=03b6b78f-41f9-4d61-8732-38162bd01aee&algo_exp_id=03b6b78f-41f9-4d61-8732-38162bd01aee-6&pdp_ext_f=%7B%22sku_id%22%3A%2212000030238794363%22%7D&pdp_npi=2%40dis%21USD%215.2%212.55%21%21%21%21%21%4021021b4716737741871477607d0688%2112000030238794363%21sea&curPageLogUid=6gPrMRnkkMAC)
https://www.aliexpress.com/item/1005005137561823.html?spm=a2g0o.productlist.main.7.35088e4dVCvjml&algo_pvid=7fc2c91f-1c6d-4171-9bdb-b5bf67d00136&algo_exp_id=7fc2c91f-1c6d-4171-9bdb-b5bf67d00136-3&pdp_ext_f=%7B%22sku_id%22%3A%2212000031812337481%22%7D&pdp_npi=2%40dis%21USD%219.98%214.99%21%21%21%21%21%4021224e9b16737743176432370d0666%2112000031812337481%21sea&curPageLogUid=HBw3NdErKt0S (https://www.aliexpress.com/item/1005005137561823.html?spm=a2g0o.productlist.main.7.35088e4dVCvjml&algo_pvid=7fc2c91f-1c6d-4171-9bdb-b5bf67d00136&algo_exp_id=7fc2c91f-1c6d-4171-9bdb-b5bf67d00136-3&pdp_ext_f=%7B%22sku_id%22%3A%2212000031812337481%22%7D&pdp_npi=2%40dis%21USD%219.98%214.99%21%21%21%21%21%4021224e9b16737743176432370d0666%2112000031812337481%21sea&curPageLogUid=HBw3NdErKt0S)
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The range will depend greatly on the environment. Objects in the path between transmitter and receiver. RF noise, especially near the receiver.
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The range will depend greatly on the environment. Objects in the path between transmitter and receiver. RF noise, especially near the receiver.
Yes of course, clear LOS is preferable but not always necessary.
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With 433MHz, small objects like a few trees or cars are fine, but terrain or dense forest is not.
5-10km is a lot; any off-the-shelf legal solution won't probably work. Going to illegally high transmit power is probably the solution.
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I have tested it up to 12km at these https://reyax.com/products/rylr896/ (https://reyax.com/products/rylr896/)
that if there has to be nothing between them, I tried them in an area free of city interference, in a rural area.
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This one covers 5km. The operating frequency is 2.4GHz.
https://www.aliexpress.com/i/3256801313642271.html?gatewayAdapt=4itemAdapt (https://www.aliexpress.com/i/3256801313642271.html?gatewayAdapt=4itemAdapt)