[Question] schematic to connect an LED to verify RF activity

[chrisinkc]

I would like to add an LED to the DHT node or any node for that matter, that will light up whenever a signal is sent via the RF chip.  This would function just like the LED on the Gateway.

I searched the forum and I couldn't find anybody else that was doing this.

The gateway uses D9 as a signal for the LED.  In the DHT Node, D9 is being used for the BC547 transistor.  Can you just assign another digital output that is not being used?

[greginkansas]

Yes I do this on most of my nodes. On some I put a Led on the RX also.

void txRadio() // Transmits the 'mes'-struct to the gateway
{
digitalWrite(TXLED, HIGH);
retx = true;
int i = 0;

while (retx && i<6) {
if (radio.sendWithRetry(GATEWAYID, (const void*)(&mes), sizeof(mes),5, ACK_TIME)) {
retx = false;
#ifdef DEBUG
Serial.print(" message ");
Serial.print(mes.devID);
Serial.println(" sent...");
Serial.print("Transmit Level=");
Serial.println(radio._transmitLevel,DEC);
Serial.print("getAckRSSI=");
Serial.println(radio.getAckRSSI(),DEC);
// Serial.print(" [radio.RSSI:");Serial.print(radio.RSSI);Serial.println("]");
#endif
} else delay(500);
i++;
}
numtx = i; // store number of retransmissions needed
#ifdef DEBUG
if (retx) Serial.println("No connection...");
#endif
digitalWrite(TXLED, LOW);
} // end txRadio