![]() ![]() A color sensor will typically output the intensity of each of these colors as a digital or analog signal which can be read by the Arduino. This is similar to the way a digital camera works. Paint color sensing, to compare paint colors between walls (I studied with someone who turned this into a business),Ĭolor sensors work by using an array of photo detectors with red, green, and blue filters.Sorting objects, imagine colored tags attached to objects and your Arduino is able to sort them,.This matches the way a computer stores colour as a combination of red, green, and blue (RGB). ColorĬolor sensors detect the visible color of an object, typically as a combination of red, green, and blue intensities. Cost depends on the speed of air flow you expect (very slow and very fast are expensive) and the accuracy with which you need the speed measured. They can also be used to detect speed (though I reckon wheel rotation – see Hall Effect sensor below – is a better way to measure speed for an Arduino project).Īnalog air flow sensors are available, the output voltage corresponds to the air flow rate. They can also work using lasers.Īir flow sensors are big business as they can be used in industrial manufacturing settings, mining, automotive and safety critical applications (e.g. ![]() These sensors typically work by measuring the change in temperature over a surface due to the flow of air over that surface. Air FlowĪir flow sensors detect how fast air is flowing through the sensor, typically measured in liters per minute. Soil moisture sensors are typically connected to the analog pin on an Arduino. An example of a soil moisture sensor can be found here. Typical cost of soil moisture sensor: $4 – $5. Current is run through the probes to give the sensor a measurement of the resistance between the two probes: More resistance means dryer soil. The sensor has two probes which are inserted into the soil. If you’re interested in this, check it out here: /make-money-with-arduino/Īn Arduino collects data from sensors and can upload it to the cloud Soil MoistureĪ soil moisture sensor is used to measure the moisture of soil around plants. I covered this in my recent guide on how you can make money with Arduino. Some sensors also offer a digital interface which can be connected to using the Arduino’s SPI, UART, or I2C libraries.Ĭollecting data is also a way to make money with Arduino. Most sensors connect to the Arduino’s analog input pin, and their data can be read by reading that pin.
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