The Vin socket on the Arduino is the same voltage as the power plug, i.e. The aim of this is to reduce the number of wires connected with Arduino. This happens most commonly if you are switching inductive loads, like motors, ceiling fans, etc, but can also happen when switching incandescent lights and is caused either by the contacts welding close due to high initial current OR arcing on opening and continuing to pass current. The 4 Relay Shield comes preassembled, and also includes a plastic protective undercase. We'll assume you're ok with this, but you can opt-out if you wish. Most relay modules sold to connect to Arduino are power relays and are rated for either 110V or 240V. In these cases you have to be careful about how the 12V relay coil is driven by the 5V Arduino output. Added to this is the current required by the IN input to trigger the coil. The specification for the SainSmart say each channel needs 15mA to 20mA to drive it. We will code this so that if you press the 1 key the Relay will be activated, if you then press the 1 key again the relay will be switched off. Basically you take the two leads running to the device, say the RGB strip, and cut one of the leads and connect one of the cut ends it to the Common (C) and the other to the Normally Open (NO) relay terminals. Solid State relays can get very hot and burn out if the heat sink is too small. digitalWrite(RELAY1, HIGH); // This will Turn Relay 1 Off so when the loop starts your relay will be off......if not they will all be on. In fact most industrial application do just that. The relay is 5V so everything is at the same voltage. The photo above shows an example connection for 12V optically isolated relay. You can control the A0 to A5 as outputs by referencing them as Pins 14 to 19 in your code. The Relay Shield is an Arduino compatible smart module with 4 mechanical relays providing an easy way to control high voltage. Arduino code for 4 to 16 channel 5V Relay module . Reply The control input is DC 3 to 32 Volts. The solid state relay can be controlled with 3V, so is suitable for the 3.3V arduino boards. In Seeed Studio's 4 channel relay board, the relays are controlled by D4,D5,D6 and D7 so you can just plug this relay shield on top the Bluetooh Shield V2 to get a complete remote control of up to 4 relays controlled by Android and pfodApp. Look for the MIN Drain-to-Source Breakdown Voltage to see how much voltage the board can switch. However, there are applications where a mechanical switch contact may be required to routinely handle currents below normal wetting current limits (for instance, if a mechanical selector switch needs to open or close a digital logic or analog electronic circuit where the current value is extremely small). Very compact design that can fit on top of Arduino UNO. When the relay is un-powered the NC terminal is connected to the COM terminal and the NO terminal is not connected. Control 8 relays, plus 2 servos, completely independently AND simultaneously with an ARDUINO 'Nano' and a simple sketch based on Object Oriented Programming and State Machines methods. The simplest solution for on/off Home Automation is to use the free pfodDesigner to design your control for upto 4 switches and then use a Arduino Uno + Bluetooth module + 4 channel relay board powered by a USB power supply and controlled by pfodApp and, if switching mains power, have an electrician wire it in. A relay is basically a switch which is operated electrically by electromagnet. With integrated xbee socket and APC220 socket, it can be wirelessly The Relay Shield provides four high-quality relay that can control high current loads to Arduino / Seeeduino boards. However it takes about 12mA to switch the solid state relay, so do check that your board can supply that amount of current from a digital output. It is just that you have to take a lot of care to ensure the motor spikes don't destroy your SSR and vise vera. Arduino Input Shield Introduction. An alternative to relays for switching low to moderate DC voltages is FETs. Typically with 8 relays but some with 16 relays. Arduino 4 Relays Shield. The design of the necessary protection is situation specific and beyond this posting (and my experience). I think you would need to use the Arduino relay to switch the voltage to the coil of the HIGH POWER relay that actual switches between solar and mains power. b) Choose a relay that is rated for the current you need to switch. The ratings are usually printed on the relay case. The coil resistance is about 500 ohms so when D7 is high (+5V) most of the voltage appears across the coil (I.e ~4.7V ) (search for Ohm's Law or checkout Sparkfun's tutorial) The “pull in” voltage on the datasheet for the TRR-1A 5V reed relay is 3.75V which means any voltage higher that than must close the contacts so 4.7V is more then enough to ensure the relay operates. d) Always attach the relay to a suitable heat sink using a thin smear of thermal compound that completely covers the base of the relay. You can build your own board using the following files: Description Operating Voltage 5V Coil current consumption 140 mA (with all relays on, about 35 mA each) Hi! When you are selecting a relay to connect to your Arduino you need to consider, a) the power (voltage and current) of what you want to switch on and off andb) the power (voltage and current) required to drive the relay (i.e. The DFRobot Relay shield V2.1 is capable of controlling 4 relays. 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