Simple Question: Does anyone know a good and cheap radio transmitter and receiver where the transmitter is a USB device that can be plugged into my laptop, and the receiver uses some protocol to connect to the esp32?
Bluetooth ? WiFi ?
You could just connect both with wifi as esp32 has inbuilt WiFi feature
if you DON'T wanna use,
you have to get 2 esp32 boards or dedicated radio modules such as Lora, RF 433MHz along with another microcontroller, so you can set up 2 boards to communicate with each other program one board to serial dump the data so you can plug it into your computer and receive the data.
I probably should have clarified, I need to use Radio communication as the distance is around 50m to 500m. As well as the main reason for asking this question was I have no clue about radio communication and without getting too much into specs, I just wanted a link to some modules I can buy that can communicate on these distances.
(to my knowledge)
For that, I think the Lora Module will fit. Also, you need another microcontroller!
have a look at the LilyGO/TTGO-LORA32/tree/LilyGO which has an ESP32, LoRa module and an OLED display on a PCB
use a pair - connect one to your laptop using serial or WiFi and use the other as your remote device
check the LoRa frequency for your country
Many ESP modules have a WiFi/Bluetooth radio built in, which runs ESP-NOW for communications up to about 200 m, clear line of sight.
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