Tag Archives: Arduino UNO

How to use a relay module with Arduino

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4-Channel relay module

4-Channel relay module

To control voltage fed else than we can use Arduino devices most common method is by relays. The relays provide us with electrical isolation between Arduino and the device in question we want to control such a lighting system, an engine AC or DC. Thus by means of Arduino digital pins we put on and off electrical appliances with a 0 or a 1.

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How to use Non-invasive AC Current Sensors with Arduino

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Non-invasive AC Current Sensor SCT-013-000.

Non-invasive AC Current Sensor SCT-013-000.

Non-invasive AC Current Sensors are a good way to measure real consumption without altering the electrical composition of the elements to be analyzed. They work by magnetic induction, so that the field generated in the cable, used to power the device, induces a current in the transformer integrated in the sensor. In this way we can know what the current is in the power cable and therefore the actual consumption of the device to be measured.

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DHT11: digital temperature and humidity sensor

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Temperature and humidity sensor

Temperature and humidity sensor

If you are looking for a low cost sensor for measuring temperature and humidity one of the most common options is the DHT11 sensor. It has excellent quality, fast response, interference protection, digital communication and accurate calibration. All this makes it one of the most used for small home projects like greenhouses, home automation, controls temperature regulators, indoor thermometers or relative humidity sensors. Continue reading

Connect 1.8″ TFT SPI to Arduino UNO

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Test TFT connected to Arduino with the text “Scidle.com”

 If you are thinking of doing a project with Arduino UNO and need to view data without having to show them through a serial or USB port on your computer, you’ll need a small screen or display. Let’s see how to use a TFT 1.8″ by SPI. It is not designed for use with an Arduino UNO so its I/O ports do not work 3.3V but 5V. What it allows is powered at 5V, in fact if we feed it to 3.3V for use with an Arduino Nano or 3V Trinket have to short the JP1 connection to not use the voltage regulator that powers both the TFT as the SD card. In this case we will not use the SD Card, but also works at 3.3V, although explain its use in another entry.

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