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+--- Thread: R503 do'nt scan fingerprints (/showthread.php?tid=8187)
R503 do'nt scan fingerprints - remiasz - 06-13-2025
Fingerprint sensor R503 do not scan finger. I use KC868-A16 with ESPHome.
Sensor is connected to HT1/2 port as Uart. I can control aura led but I get only "No touch sensing" message.
"Wakeup" signal connected to HT3 all time is OFF. When I send command to enroll "Wakeup" goes to ON but sensor dont scan any finger.
Can anyone help?
RE: R503 do'nt scan fingerprints - admin - 06-15-2025
HT1/2 are 1-wire port, connect with 1-wire sensor, such as DS18B20. Because it have pull up resistance on pcb. if you want use as UART, need remove it.
RE: R503 do'nt scan fingerprints - remiasz - 06-15-2025
UART on HT1/2 is working. I can communicate with R503 and control aura led.
What pins can I use on UART if not HT1/2?
I used HT1/2 as UART sooner with RFID reader and it was worked.
RE: R503 do'nt scan fingerprints - admin - 06-16-2025
actually KC868-A16 no free GPIOs.
RE: R503 do'nt scan fingerprints - remiasz - 06-16-2025
You were right. I connected R503 to S3 Super Mini module and it started reading fingerprints. Pulling to 3V disrupts UART operation?
Thanks for advise
RE: R503 do'nt scan fingerprints - admin - 06-17-2025
Pulling to 3V disrupts UART operation? Yes