raspberry pi EP-0099 4 channel relay module schematic

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raspberry pi EP-0099 4 channel relay module schematic

RustyOx Offline

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30-06-2022, 04:46 PM (This post was last modified: 28-07-2022, 10:17 AM by RustyOx.)

I bought this for my home automation project, it is planned to be used to control siren and flashlight for my security system.

Board was bought from Amazon.

I noticed that the NC, NO is labelled wrong. The NC pin on board is actually normal open (NO).

It doesn't fit well on my Raspberry Pi 4 case, after cut some bits and drill a few holes ( for heat dissipation purpose), I have managed to put it in the Raspberry Pi case.

.pdf

raspberry pi EP-0099 relay module schematic.pdf (Size: 860.23 KB / Downloads: 0)

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RustyOx Offline

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30-06-2022, 04:47 PM (This post was last modified: 30-06-2022, 06:36 PM by RustyOx.)

use command below to enable I2C interface (in menu "2 Interface Options" -> "P5 I2C").

sudo raspi-config

Below command could be used to check I2C address
sudo i2cdetect -a -y 1

Example code in Python

Code:
import time

import smbus

import sys

DEVICE_BUS = 1

DEVICE_ADDR = 0x10

bus = smbus.SMBus(DEVICE_BUS)

while True:

    try:

        for i in range(1,5):

            print("\nturning on  %d" % i)

            bus.write_byte_data(DEVICE_ADDR, i, 0xFF)

            time.sleep(2)

            print("turning off %d" % i)

            bus.write_byte_data(DEVICE_ADDR, i, 0x0)

            time.sleep(3)

    except KeyboardInterrupt as e:

        print("Quit")

        sys.exit()

python test code for raspberry pi EP-0099 4 channel relay module.PNG (Size: 13.21 KB / Downloads: 21)

Output:

Code:
pi@raspberrypi:~ $ python3 test_relay.py

turning on  1

turning off 1

turning on  2

turning off 2

turning on  3

turning off 3

turning on  4

turning off 4

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RustyOx Offline

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30-06-2022, 04:48 PM

test commands:
Turn on channel No.2 relay

i2cset -y 1 0x10 0x02 0xFF

Turn off channel No.2 relay

i2cset -y 1 0x10 0x02 0x00

Turn on channel No.3 relay

i2cset -y 1 0x10 0x03 0xFF

Turn off channel No.3 relay

i2cset -y 1 0x10 0x03 0x00

Turn on channel No.4 relay

i2cset -y 1 0x10 0x04 0xFF

Turn off channel No.4 relay

i2cset -y 1 0x10 0x04 0x00

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RustyOx Offline

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30-06-2022, 04:49 PM

i2c address table for raspberry pi EP-0099 4 channel relay module

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