Sensors

Load cell is a small device that is able to weigh the load on it. Due to the load, it provides very small output voltages that need to be amplified (eg using op-amp or ADC with a built-in op-amp) to find the use for the module. It incorporates two invariable two variable resistors connected to the Wheatstone Bridge. This sensor is made from high-quality materials, so it does not get affected by high temperature or continous load. You need to connect it with the HX711 to read information with Croduino.

A phototransistor is a component that is able to detect light. This phototransistor is special because (due to their dark lenses) it detects infrared (IR) light better than the other. Therefore, it is practical for fire detection, sunlight etc.

Soldered has created a module with an LM393 voltage comparator using this sensor. Check it out here.

These magnetic door switch sensors are already seen, if not – then in old movies for sure where they were used as anti-theft devices, ie. alarm systems. In fact, it is a magnet and the reed switch inside a pair. When they are close to each other (recommended 13mm or less), reed switch closes. Connect it to Croduino / Arduino as an ordinary switch use the detection of open doors, windows, drawers, cupboards etc.

• Voltage: max. 200V, best used 5V Croduino/Arduino
• Max reed power: 100mA
• Max detection distance: 15mm, 13mm recommended
• Dimensions: 29 x 14 x 9mm
• Cable length: 30cm

Thermocouple is a temperature measuring device, with its range usually bigger than standard sensors. If you’ve ever bought a multimeter and got some kind of temperature sensor, that is the thermocouple.

This small sensor will measure the current that passes through his wire transformer and the information you get in return is in the form of a small stream. That small current will be measured as a voltage drop that is already built into this sensor. The sensor works on the principle of an open transformer. It’s not as complicated as it sounds. For more details, check out the datasheet.

Only one wire put through the hole!

This small sensor will measure the current that passes through his wire transformer and the information you get in return is in the form of a small stream. That small current will be measured as a voltage drop that is already built into this sensor. The sensor works on the principle of an open transformer. It’s not as complicated as it sounds. For more details, check out the datasheet.

Only one wire put through the hole!

Although many do not know, there is a camera that can work with Arduino / Croduino. It is a CMOS camera, with VGA quality images that are connected to Croduino via I2C. Now it’s your turn to think of the application! Maybe combine with a motion sensor that could be activated if you someone entered the room?

Vibration sensor SW-18020 is actually a switch that reacts (connects) to vibration, ie. moves. Thus, when a force acts on the sensor, it is connected, and when the force does not work, it is not connected.

e-radionica.com has created a module with an LM393 voltage comparator using this sensor. Check it out here.

 • Dimensions: 4.5mm diameter, 10mm high

Gas sensor MQ7 detects the presence of Carbon Monoxide (CO) in the air. The best results are given when alcohol is in liquid form, however, it still does an amazing job when measuring in gas form. It needs a bit of time to warm up in order to work correctly.

MQ-4 methane gas sensor registers the presence and concentration of natural gas and methane (CH4). The best results are given when gas is in liquid form, however, since situations like this are rare, it does its job pretty well when in gas form, too. It needs a bit of time to warm up in order to work correctly.

The membrane keyboard is a system of 16 keys that are mutually connected and enable us more complex entry to Dasduino/Arduino. Using this keyboard, you can create whole systems of menus, data input, and adjustment of different parameters.

DS18B20 is a waterproof temperature sensor packed in metal and waterproof housing. For communication with Dasduino/Arduino, it uses only one wire and it is possible to put up to 127 sensors on one code and measure temperature in 127 different places by using just one wire!

Check out: „How to use a module?“  in the TUTORIAL section for the information on how to use the sensor, how to connect it to Dasduino/Arduino and downloading the library.

HC-SR04 is a widely used and popular sensor that can be used for measuring the distance between itself and the object that is placed in front of the sensor. Connecting to Dasduino itself is simple, the sensor requires only two codes for controlling and uses 5V voltage. There is also a library that provides us with distance information. Make sure you check „How to use module“ in the TUTORIALS category.

DHT11 is the simplest temperature and humidity sensor that can find. It connects to Dasduino in a very simple way using just one code (video below) and gives you back two variables as temperature and humidity.

It does not require extra calibration to work, just plug it in and use it. Look up the library for it in the TUTORIAL section.