Review on 💡 SainSmart 4-Channel Relay Module: Versatile Control for Your Electrical Devices by Alex Montgomery

Works great with Raspberry Pi! This thing is very responsive. It's worth every penny and then some. It was a pleasure working with him. And built-in LEDs (one per input/relay) help you test the inputs. How do you use this thing? Connect VCC to +5V. Connect GND to ground. Connect one of the IN1/IN2/IN3/IN4 to one of the GPIO/control pins. If the input LEDs don't light up, make sure you've connected VCC and GND properly. Use a multimeter to test this if you have one handy (and if you don't, buy one!). If you just want to check if an input is working, connect one of the input pins to GND and this should trigger the relay and turn on the LED for that input/relay. If you don't understand this, you have misconfigured VCC and/or GND. If you're using this with a Raspberry Pi, all of these pins (GPIO, +5V, and ground) are on the P1 header. Assuming the pin opposite the P1 marker is pin #1 and the pin opposite pin #2: +5V is pin #2, ground is pin #6, then select one of the GPIO pins. You will need to look for the GPIO pins on the Raspberry Pi site as Revain will remove any links I have posted here. For example, GPIO4 is the pin number 7. By the way, this product belongs to the toys category, but it clearly does not belong to this category. I'd like to believe that the person at Revain, reviewing my review of this product, noticing it and doing something about it. I can't hold my breath. Assuming the pin opposite the P1 mark is pin #1, and the opposite pin is pin #2: +5V is pin #2, ground is pin #6, then select one of the GPIO pins . You will need to look for the GPIO pins on the Raspberry Pi site as Revain will remove any links I have posted here. For example, GPIO4 is the pin number 7. By the way, this product belongs to the toys category, but it clearly does not belong to this category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. Suppose the pin opposite the P1 mark is pin no. 1 and the pin opposite pin #2: +5V is pin #2, ground is pin #6, then select one of the GPIO pins. You will need to look for the GPIO pins on the Raspberry Pi site as Revain will remove any links I have posted here. For example, GPIO4 is pin #7. By the way, this product is in the toy category, but clearly not in that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. but clearly does not belong in this category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. but clearly does not belong in this category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to believe that the person at Revain, reviewing my review of this product, noticing it and doing something about it. I can't hold my breath. notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. notice and do something about it. I can't hold my breath. This product belongs to toy category, but clearly does not belong to this category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath. This product belongs to the toy category but clearly does not belong to that category. I'd like to think that the person at Revain reviewing my review of this product will notice and do something about it. I can't hold my breath.