<</b>
- Voltage and voltage dividers
- Capacitors.
<br>
<b>Analog to digital converter (ADC) in a microcontroller.
- [Sparkfun tutorial](https://learn.sparkfun.com/tutorials/analog-to-digital-conversion/all) and [Arduino reference](https://www.arduino.cc/reference/en/language/functions/analog-io/analogread/)
- [How fast can a conversion happen?](./ADC_test.txt)
- [What resolution?](https://www.arduino.cc/reference/en/language/functions/zero-due-mkr-family/analogreadresolution/)
- [ItsyBitsy M4](https://www.adafruit.com/product/3800), [Metro M0](https://www.adafruit.com/product/3505?gclid=EAIaIQobChMIk7PksOyn6gIVhK7ICh00FwkhEAAYASAAEgJPufD_BwE)
- [Mapping](https://www.arduino.cc/reference/en/language/functions/math/map/)
- [Averaging.](./average.txt)
<br>
###Sensors based (more or less) on voltage dividers.
<br>
<b>[Button](./Button/index.html)</b><br>
<b>[Velostat ](https://www.adafruit.com/product/1361) is a force-senstive flexible material.</b>
<br>
<b>[Potentiometers ](./../Electronics/electronics_basics/electronic_basics.html)</b>can be used to sense rotation or position.
<br>
<b>Light</b>
- [phototransistor and photoresistor.](./Light/Photodetectors/index.html)
- [Color and spectrum.](./Light/color_spectrum/index.html)
<br>
<b>Temperature</b>
- Analog sensor, [mcp9700](./Temp/index.html)
- [Thermistors](./Thermistor/index.html), see also [adafruit tutorial](https://learn.adafruit.com/thermistor/using-a-thermistor)
- [Thermistor as flow sensor](https://roberthart56.github.io//projects/Thermistor_anemometry/index.html)
<br>
<b>Magnetic field.</b>
- [Hall sensor](./magnetic/index.html)
- Sensors derived from Hall sensor.
<br>
###Sensors based on electric field.
<b>Capacitance.</b>
- [Touch sensor, as used by Arduino library](./CapacitiveTouch/index.html)
- [Step response (transmit-receive) capacitive sensing](./tx_rx_sensors/index.html)
###Sensors that create a voltage.
<b>Sound.</b>
- [Piezoelectric discs as contact mics.](./piezo.html)
- [Sound modules](./Sound_input/index.html)
<br>
###Sensing motion and position.
<br>
<b>Motion</b>
- Accelerometers
- [Digital Accelerometers](./digital_accelerometers/index.html)
- Analog Acceleromters.
- made by you.
- Tilt (same as accelerometer)
- Vibration
- [Radar module](https://www.electroschematics.com/13246/get-started-microwave-radar-motion-sensor/)
<br>
<b>Proximity/Distance</b>
- [Infrared LED-photransistor](./Proximity/index.html)
- Macro
- Micro
- Ultrasonic modules.
- Capacitance
<b>[HTMAA input devicves page](http://academy.cba.mit.edu/classes/input_devices/index.html)</b>
]]>