---
product_id: 1170701
title: "16-Channel 12V Relay Module Board for Arduino DSP AVR PIC ARM"
brand: "sainsmart"
price: "€ 43.45"
currency: EUR
in_stock: true
reviews_count: 8
category: "Sain Smart"
url: https://www.desertcart.nl/products/1170701-16-channel-12v-relay-module-board-for-arduino-dsp-avr
store_origin: NL
region: Netherlands
---

# 12V coil voltage LED status indicators 16 independent relay channels 16-Channel 12V Relay Module Board for Arduino DSP AVR PIC ARM

**Brand:** sainsmart
**Price:** € 43.45
**Availability:** ✅ In Stock

## Summary

> ⚙️ Command Your Smart World with 16 Channels of Power!

## Quick Answers

- **What is this?** 16-Channel 12V Relay Module Board for Arduino DSP AVR PIC ARM by sainsmart
- **How much does it cost?** € 43.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nl](https://www.desertcart.nl/products/1170701-16-channel-12v-relay-module-board-for-arduino-dsp-avr)

## Best For

- sainsmart enthusiasts

## Why This Product

- Trusted sainsmart brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Expand Your Control Horizon:** 16 channels provide extensive scalability for complex smart home or robotics projects.
- • **Robust Isolation for Safety:** Opto-isolated inputs protect your microcontroller from voltage spikes and interference.
- • **Visual Feedback at a Glance:** Built-in LED indicators let you monitor relay status instantly, reducing debugging time.
- • **Power Your Projects with Precision:** Supports high-current loads up to AC250V 10A / DC30V 12A for versatile appliance control.
- • **Seamless Microcontroller Integration:** Compatible with Arduino, ARM, PIC, and more for effortless DIY automation.

## Overview

The SainSmart 16-Channel Relay Module is a 12V interface board designed for professional-grade control of high-current devices. Featuring 16 independent relays rated up to 10A AC and 12A DC, it integrates seamlessly with popular microcontrollers like Arduino and ARM. Its opto-isolated inputs and LED status indicators ensure safe, reliable operation and easy diagnostics, making it the ultimate control hub for advanced automation, robotics, and smart home projects.

## Description

This is a 12V 16-Channel Relay interface board. It is able to control various appliances, and other equipments with large current. It can be controlled directly by Micro-controller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic).Features:12V 16-Channel Relay interface board, and each one needs 15-20mA Driver Current;Equipped with high-current relay, AC250V 10A ; DC30V 10A;Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic);Indication LED's for Relay output status.

Review: High quality. Wish it came with ANY documentation - Ok, I admit it, it took me way too long to figure out how to hook this thing up. In case anyone else is looking at this and wondering how it works, here's how it gets hooked up: 1) The header pins on the bottom of the main picture get wired directly to the Arduino board. Connect one of the 5v pins to a 5v header on your Arduino and connect one of the Gnd pins to a ground header on the Arduino. Each one of the relays has a corrosponding header down there, too, which get connected to a digital output on your Arduino. You can run each wire individually or run over a ribbon cable to a project board and break it out from there. Either way, getting the header pins hooked up allows the logic to fire, and makes the lights work so you can at least diagnose/debug your program. 2) Next, the relay board needs a 12v dc input wired up to the blue terminals on the bottom. These are wired to the relays, which make the relays actually fire. The voltage magnetically pulls a piece of metal away from one pole to the other. This action makes a noticeable clicking noise, which is a little annoying, but also lets you know it's working. 3) Each relay has 3 terminals located along the sides. One side is normally opened, the other is normally closed. Use this to either make or break the circuit that you have wired up for your lights, motors, or whatever else is involved in your project that draws more than 5v or needs to be kept isolated from the Arduino board. So yeah, keep in mind that you'll need a 12v power source to actually make the relays fire. All in all, it's a very well put together board, and would make a great control hub for something like say... a model train set or robot.
Review: Sainsweet 16 channel Relay Module concepts - The Sainsmart 16 Relay board is an inexpensive bargain. The primary purpose is to isolate the computer from the outputs. RFI or spikes can travel down a wire into a computer and mess up the logic causing any output to go on randomly. This board provides isolation in the relays, the standard usually being 1500 volts and opto isolation on the inputs using an optoisolator diode and optical transistor driving an amplifier. The board is wired when the ground is connected between the computer and the relay board. This is the only power connection needed along with the 16 discreet inputs which operate the relay with a ground input to one of the 16 pins on the header of the board. The 5volt pins 19 and 20 are sufficient to provide power for the computer but the real purpose is to provide input power to run the opto-isolators. Apparently this board has been provided with either 5volt or 12 volt relays. You should check the relay marking before connecting power on the power input pins. The Relays are SPST non-connected contact types, so you may wire virtually any load, but beware that the PC board and the associated connectors will probably not really handle much more than an amp at up to 120vac or 36vdc even though the relay is rated at a higher loads for its contacts. A good input source is Elegoo Mega pins 22 to 55 or a string of 74HC595 serial shift registers. If you connect two relay boards, you will probably need to breakout the wires to prevent connecting a solid 5vdc source to an input pin on the Mega. Note that the Mega has a female socket and the relay board has a male socket. Twenty wire Multicolor flat cable with connectors is a good choice for wiring. Also note that the inputs support open collector inputs which permit wired "OR" wiring. Personally, I would not use the 5vdc pins for anything other than the relay board. For safety operation I would provide +12Vdc at about 0.8Amps or more. I use this board to power 16 slow motion Tortoise switch machines on my Model Railroad using a +12vdc and a +24vdc power source. You really don't need a schematic since the relay board is so redundant in its wiring. The 5 volt converter is a LM2576 12v to 5v 3 amp converter.

## Features

- 12V 16-Channel Relay interface board, and each one needs 15-20mA Driver Current
- Equipped with high-current relay, AC250V 10A ; DC30V 12A
- Standard interface that can be controlled directly by microcontroller (Arduino , 8051, AVR, PIC, DSP, ARM, ARM, MSP433, TTL logic)
- Indication LED's for Relay output status

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0057OC66U |
| Best Sellers Rank | #3,028 in Single Board Computers (Computers & Accessories) |
| Brand | SainSmart |
| Coil Voltage | 12 Volts |
| Connector Type | Through Hole |
| Contact Current Rating | 12 Amps |
| Contact Material | Silver |
| Contact Type | Normally Open |
| Current Rating | 10 Amps |
| Customer Reviews | 4.4 4.4 out of 5 stars (616) |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8.4 ounces |
| Item model number | 101-70-103 |
| Manufacturer | SainStore Inc. |
| Manufacturer recommended age | 1 - 1 months |
| Maximum Switching Current | 12 Amps |
| Maximum Switching Voltage | 250 Volts |
| Minimum Switching Voltage | 12 Volts |
| Mounting Type | PCB Mount |
| Operation Mode | Automatic |
| Product Dimensions | 8 x 5.7 x 1.19 inches |
| Release date | May 6, 2018 |
| UPC | 796793392285 |
| Wattage | 144 watts |

## Product Details

- **Connector Type:** Through Hole
- **Contact Material:** Silver
- **Contact Type:** Normally Open
- **Current Rating:** 10 Amps
- **Mounting Type:** PCB Mount

## Images

![16-Channel 12V Relay Module Board for Arduino DSP AVR PIC ARM - Image 1](https://m.media-amazon.com/images/I/71iAO6BUk9L.jpg)

## Available Options

This product comes in different **Pattern** options.

## Questions & Answers

**Q: Does anyone know if this is compatible with raspberry pi model b?**
A: I bought this board specifically to work with the Raspberry PI. I've futzed with it for hours and the complete lack of documentation makes it very hard to get it up and running. Through trial and error though I've found the following setup works:1) Hook up the pair of screw terminals (in blue plastic) to an external 12v power supply2) Hook up the 3.3v out on the RPi (pin 1) to the 5v pin on the relay board (I know, this doesn't make sense)3) Hook up any GPIO pin to any of the 16 input pins on the board4) Toggle the GPIO pin using your favorite method5) The relay will toggle nowWhat threw me was using the 3.3v on the RPi instead of the marked 5v. That is very confusing labeling. It's also unfortunate that this board requires a 12v supply which can't come from the RPi but must be applied externally. My project, happened to have one so I was lucky. I hope this information helps. It would be so easy for SainSmart to offer this on their website and help out alot of folks having trouble.

**Q: What there are two power inputs? (Low level inputs (5V) and blue port (12V)). Do I need to connect both?**
A: The board takes 12V input to operate.   I use a at least 1-2 amp power supply and that connects to the 12V inputs.   There is a 5V OUTPUT on the board which is convenient and can be used to power something like an Arduino.  Which is what I do.

**Q: I have an application where the output voltage to switch the contacts is 12 volts, will the inputs tolerate this or will I need to add resistors?**
A: Yes, it will.  I have this hooked up to some led work lights in a store display.  40 of them.  Power the board with 12v at the 2 screw terminals, and use your switched outputs directly to the low level inputs and it will switch on the relays.  Pretty simple.,

**Q: Are there diodes across the relay coils?**
A: Yes, they light up when the relay is on

## Customer Reviews

### ⭐⭐⭐⭐⭐ High quality. Wish it came with ANY documentation
*by J***I on November 9, 2012*

Ok, I admit it, it took me way too long to figure out how to hook this thing up. In case anyone else is looking at this and wondering how it works, here's how it gets hooked up: 1) The header pins on the bottom of the main picture get wired directly to the Arduino board. Connect one of the 5v pins to a 5v header on your Arduino and connect one of the Gnd pins to a ground header on the Arduino. Each one of the relays has a corrosponding header down there, too, which get connected to a digital output on your Arduino. You can run each wire individually or run over a ribbon cable to a project board and break it out from there. Either way, getting the header pins hooked up allows the logic to fire, and makes the lights work so you can at least diagnose/debug your program. 2) Next, the relay board needs a 12v dc input wired up to the blue terminals on the bottom. These are wired to the relays, which make the relays actually fire. The voltage magnetically pulls a piece of metal away from one pole to the other. This action makes a noticeable clicking noise, which is a little annoying, but also lets you know it's working. 3) Each relay has 3 terminals located along the sides. One side is normally opened, the other is normally closed. Use this to either make or break the circuit that you have wired up for your lights, motors, or whatever else is involved in your project that draws more than 5v or needs to be kept isolated from the Arduino board. So yeah, keep in mind that you'll need a 12v power source to actually make the relays fire. All in all, it's a very well put together board, and would make a great control hub for something like say... a model train set or robot.

### ⭐⭐⭐⭐⭐ Sainsweet 16 channel Relay Module concepts
*by R***S on February 13, 2017*

The Sainsmart 16 Relay board is an inexpensive bargain. The primary purpose is to isolate the computer from the outputs. RFI or spikes can travel down a wire into a computer and mess up the logic causing any output to go on randomly. This board provides isolation in the relays, the standard usually being 1500 volts and opto isolation on the inputs using an optoisolator diode and optical transistor driving an amplifier. The board is wired when the ground is connected between the computer and the relay board. This is the only power connection needed along with the 16 discreet inputs which operate the relay with a ground input to one of the 16 pins on the header of the board. The 5volt pins 19 and 20 are sufficient to provide power for the computer but the real purpose is to provide input power to run the opto-isolators. Apparently this board has been provided with either 5volt or 12 volt relays. You should check the relay marking before connecting power on the power input pins. The Relays are SPST non-connected contact types, so you may wire virtually any load, but beware that the PC board and the associated connectors will probably not really handle much more than an amp at up to 120vac or 36vdc even though the relay is rated at a higher loads for its contacts. A good input source is Elegoo Mega pins 22 to 55 or a string of 74HC595 serial shift registers. If you connect two relay boards, you will probably need to breakout the wires to prevent connecting a solid 5vdc source to an input pin on the Mega. Note that the Mega has a female socket and the relay board has a male socket. Twenty wire Multicolor flat cable with connectors is a good choice for wiring. Also note that the inputs support open collector inputs which permit wired "OR" wiring. Personally, I would not use the 5vdc pins for anything other than the relay board. For safety operation I would provide +12Vdc at about 0.8Amps or more. I use this board to power 16 slow motion Tortoise switch machines on my Model Railroad using a +12vdc and a +24vdc power source. You really don't need a schematic since the relay board is so redundant in its wiring. The 5 volt converter is a LM2576 12v to 5v 3 amp converter.

### ⭐⭐⭐⭐⭐ Outstanding product, incredible bargain! Perfect for use with Arduino microcontrollers.
*by L***E on March 23, 2016*

I just ordered six more of these boards via Amazon Prime. They are an incredible bargain, and available for even less on eBay if you don't mind waiting a few weeks for shipping from China. Because of previous reviews, I examined these carefully and tested every one right away. All of mine had clean, excellent build quality, and every one worked perfect out of the starting gate. Many electronic products that come out of China are of poor quality, such as some of the Arduino clones, but this Sainsmart product is very high quality. There is a lengthy review of this module by Darrell Thayer, which provides a lot of measurements on current etc. I tested all of these values with my Fluke 177 and all of Darryll's numbers are spot on. I'm using these relay modules, along with an Arduino microcontroller and "Centipede" shift register board, to control turnout solenoids, accessories, and other devices on my model railroad. Incidentally, it doesn't say if these are rated for continuous duty or not. I powered all 16 of the relays and left them energized for a few hours, and while the relay housings were a bit warm to the touch, there was no sign that they were burning up. None of the chips were warm to the touch.

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*Product available on Desertcart Netherlands*
*Store origin: NL*
*Last updated: 2026-02-17*