Hello all,
has anyone tried to use a MSP23Sxx pin as sensing pin for the R503 Fingerprint reader?
Is this possible? I do not get a working configuration.
Please don’t bother to post your (not working) configuration and logs as it might helps us to help you 
For sure sorry.
Below the configuration I’ve tried. I’ve never loaded it to the board because esphome showed me the failure message:
Cannot resolve pin name 'mcp23s17_pin9' for board d1_mini.
Maybe I already found a way. I will check this soon.
esphome:
name: "test-d1mini"
esp8266:
board: d1_mini
logger:
baud_rate: 0
api:
ota:
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "xxxxx"
password: "xxxxx"
captive_portal:
uart:
id: uart_r503
rx_pin: GPIO5
tx_pin: GPIO4
baud_rate: 57600
spi:
clk_pin: GPIO14
mosi_pin: GPIO13
miso_pin: GPIO12
mcp23s17:
- id: 'mcp23s17_hub'
cs_pin: GPIO16
deviceaddress: 0
fingerprint_grow:
sensing_pin: mcp23s17_pin9
uart_id: uart_r503
on_finger_scan_matched:
- homeassistant.event:
event: esphome.test_node_finger_scan_matched
data:
finger_id: !lambda 'return finger_id;'
confidence: !lambda 'return confidence;'
on_finger_scan_unmatched:
- homeassistant.event:
event: esphome.test_node_finger_scan_unmatched
on_enrollment_scan:
- homeassistant.event:
event: esphome.test_node_enrollment_scan
data:
finger_id: !lambda 'return finger_id;'
scan_num: !lambda 'return scan_num;'
on_enrollment_done:
- homeassistant.event:
event: esphome.test_node_enrollment_done
data:
finger_id: !lambda 'return finger_id;'
on_enrollment_failed:
- homeassistant.event:
event: esphome.test_node_enrollment_failed
data:
finger_id: !lambda 'return finger_id;'
binary_sensor:
- platform: gpio
name: "mcp23s17_pin9"
id: mcp23s17_pin9
pin:
mcp23xxx: mcp23s17_hub
number: 9
mode:
input: true
Solved with the following configuration:
sensing_pin:
mcp23xxx: mcp23s17_hub
number: 1
mode:
input: true