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I was trying to cobble something together with an esp32 that would make a handie talking that would allow text, voice and image transfers on a p2p network that

I was trying to cobble something together with an esp32 that would make a handie talking that would allow text, voice and image transfers on a p2p network that wouldn't have a range longer than a house a way, but it is a slog. Is there a modern equivalent to this or can an old android phone be repurposed to do this? I was thinking that if the frequency was shifted up to 2.4 GHz then a repurposed android device could do all of this, but alas there aren't any projects of which I have been able to find. > US variant (Model No. CY44801) has frequency range of 902-928 MHz and European variant (Model No. CY44802) with frequency range of 868-870 MHz

mynameisvlad 4y ago
Those are the LoRa frequencies so you might have more luck trying to get some modern LoRa gear communicating with it. https://en.wikipedia.org/wiki/LoRa https://en.wikipedia.org/wiki/LoRa
- tjohns 4y ago
  Those are the ISM frequencies, not specific to LoRa. Basically an unlicensed wasteland of RF where anything goes, as long as you stay below a certain transmit power level. I guarantee this device (made in the the 90s) is completely incompatible at the link layer with LoRa gear.
  - mynameisvlad 4y ago
    Some LoRa chips support multiple modulation types for non-LoRa "legacy" applications. My point is they use the same frequencies and would likely be easier than upshifting to 2.4GHz and having an Android device handle it. I didn't make any indication it would Just Work™.
  - guessbest 4y ago
    This is exactly what I was interested in, unlicensed transceiver so a novice or a kid can transmit a short distance like a handie talkie without worrying about eavesdropping. https://en.wikipedia.org/wiki/ISM_radio_band https://en.wikipedia.org/wiki/ISM_radio_band
nanomonkey 4y ago
There are several varieties of ESP32's combined with LoRa, such as the disaster radio, meshtastic and ttgo t-beam. The last one is probably the easiest bit of kit to get from Amazon and will run the other's firmware.
eternityforest 4y ago
Meshtastic sounds like what you want, but sending images over LoRa is probably gonna clog the bandwidth and annoy people. Also, there are many BLE based mesh apps like meshenger IIRC.

mynameisvlad 4y ago

Those are the LoRa frequencies so you might have more luck trying to get some modern LoRa gear communicating with it. https://en.wikipedia.org/wiki/LoRa https://en.wikipedia.org/wiki/LoRa

tjohns 4y ago
Those are the ISM frequencies, not specific to LoRa. Basically an unlicensed wasteland of RF where anything goes, as long as you stay below a certain transmit power level. I guarantee this device (made in the the 90s) is completely incompatible at the link layer with LoRa gear.
- mynameisvlad 4y ago
  Some LoRa chips support multiple modulation types for non-LoRa "legacy" applications. My point is they use the same frequencies and would likely be easier than upshifting to 2.4GHz and having an Android device handle it. I didn't make any indication it would Just Work™.
- guessbest 4y ago
  This is exactly what I was interested in, unlicensed transceiver so a novice or a kid can transmit a short distance like a handie talkie without worrying about eavesdropping. https://en.wikipedia.org/wiki/ISM_radio_band https://en.wikipedia.org/wiki/ISM_radio_band

nanomonkey 4y ago

There are several varieties of ESP32's combined with LoRa, such as the disaster radio, meshtastic and ttgo t-beam. The last one is probably the easiest bit of kit to get from Amazon and will run the other's firmware.

eternityforest 4y ago

Meshtastic sounds like what you want, but sending images over LoRa is probably gonna clog the bandwidth and annoy people. Also, there are many BLE based mesh apps like meshenger IIRC.