Raspberry Pi Relay Board v1.0

Dear Sir,



are the Raspberry Pi Relay Board v1.0 Stackable?

How I can use 5 broads together with a single raspberry? or at least 2

broads?

Do I need and external power supply?



What I must change in the software lib to get all working together?

only the i2c address!



<LINK_TEXT text=“http://wiki.seeedstudio.com/Raspberry_P … oard_v1.0/”>http://wiki.seeedstudio.com/Raspberry_Pi_Relay_Board_v1.0/</LINK_TEXT>



Thanks in advance

Hi Altous,


1. We can not stack it due to relay height.




2. You can add below connector between 2 relay shields.
https://www.modmypi.com/raspberry-pi/gpio-and-breadboarding/40-pin-gpio-connectors/40-pin-extra-tall-header-push-fit-version


3.There are four switches, three labeled A0 through A2, and one labeled NC. The NC means No Connection. Each switch has a high and a low setting, so the following table will lay out how to use them to set an I2C address for the board:
A0 A1 A2 Address
High High High 20
Low High High 21
High Low High 22
High High Low 24
High Low Low 26
Low Low Low 27
I just test it as below.
pi@raspberrypi:~ $ i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --
pi@raspberrypi:~ $ i2cdetect -y -r 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- 24 -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

4. Power consumption: relay shield current is 10~360ma, the raspberry 3b/b+ maximum total USB peripheral current draw is 1.2a, raspberry pi3b/b+ is 400~500ma. So if you use 2 relay shield, you do not need additional power supply. by the way, if you only switch 1 relay at 1 time, the power consumption also is low. you do not need the additional power supply as well.

What are the power requirements?

The device is powered by 5V micro USB. Exactly how much current (mA) the Raspberry Pi requires is dependent on which model you are using, and what you hook up to it. We recommend a 2.5A (2500mA) power supply, from a reputable retailer, that will provide you with enough power to run your Raspberry Pi for most applications, including use of the 4 USB ports. Very high-demand USB devices may however require the use of a powered hub. The table below outlines the specific power requirements of each model.

Product Recommended PSU current capacity Maximum total USB peripheral current draw Typical bare-board active current consumption
Raspberry Pi Model A 700mA 500mA 200mA
Raspberry Pi Model B 1.2A 500mA 500mA
Raspberry Pi Model A+ 700mA 500mA 180mA
Raspberry Pi Model B+ 1.8A 600mA/1.2A (switchable) 330mA
Raspberry Pi 2 Model B 1.8A 600mA/1.2A (switchable) 350mA
Raspberry Pi 3 Model B 2.5A 1.2A 400mA
Raspberry Pi 3 Model A+ 2.5A Limited by PSU, board, and connector ratings only. 350mA
Raspberry Pi 3 Model B+ 2.5A 1.2A 500mA
Raspberry Pi Zero W/WH 1.2A Limited by PSU, board, and connector ratings only. 150mA
Raspberry Pi Zero 1.2A Limited by PSU, board, and connector ratings only 100mA
Thanks

best rgds
Bill