IR Sensor connect to rpi2 gpio pin - Raspberry Pi Forums

greetings,
have tsop 34338 ir sensor , electrical characteristics of sensor https://www.vishay.com/docs/82490/tsop321.pdf.

configured gpio23 input pin follows in /etc/modules file,

code: select all

snd-bcm2835 lirc_rpi gpio_in_pin=23 

i interface ir sensor lpc1788 controller follows,

sensor input pin connected 3.3v pin in controller.
sensor output pin connected 1 of gpio pin in controller.
sensor gnd pin connected gnd pin in controller.

and check sensor output voltage,it produce 3.3v.

the same setup followed in rpi2,

sensor input pin connected rpi 3.3v pin.
sensor output pin connected gpio23.
sensor gnd pin connected rpi gnd pin.

i check output voltage , produce 2.4v.why?

why voltage drop when connect ir sensor rpi2?

i not sure lirc command sets pin input.

if set pin , input @ startup voltage change? (actuallt 2.4v "1" there may no error here.)

perhaps @ direction of pin. correct?

sudo -s
cat /sys/class/gpio/gpio23/direction

if not

echo "23" > /sys/class/gpio/export
echo "in" > /sys/class/gpio/gpio23/direction

rpi has internal weak pullups , pulldowns may activated.

raspberrypi