SparkFun Forums

[RafazZ]

I am trying to get my GT-511C3 to work on R-Pi Zero.

Setup:
FP scanner is powered by the 5V pin from the Pi, and Rx/Tx are connected to 3.3V Tx/Rx pins of the R-Pi.

Code:

Code: Select all

#!/usr/bin/env python

import wiringpi as wp
from struct import *

# 'Open' Command (little endian)
opn = pack('<BBHIH', 0x55, 0xAA, 0x01, 0x00, 0x01)

# Compute checksum
chk = sum(map(ord, list(opn)))
chk = map(chr, [chk % 256, chk / 256])
opn += chk[0] + chk[1]

wp.wiringPiSetup()
serial = wp.serialOpen('/dev/ttyAMA0', 9600)
print serial
wp.serialPuts(serial, opn)

res = []

while True:
    resp = wp.serialGetchar(serial)
    print hex(resp)
    if resp == -0x1:
        break
    res.append(resp)

# See the result
print map(hex, res)

Response:

Code: Select all

'\x55\xaa\x01\x00\x00f\x10\x00\x00\x31\x00\x50\x01'

Problem:
No matter what command I send, it always responds with '0x100F' error code. Please, advise.