ESP32 Lora v2 Ultrasonic JSN-SR04T


can you help me with my heltec esp32 lora board and ultrasonic HC-SR04 sensor.
Which pin I must use for trigger and echo?
Now I try with trigger pin on 34 and echo on 35, but it seems that it is not working, I get distance -1.00 ?
Thank you and best regards


Maybe you can use GPIO17, 22, 23.