Difference between revisions of "Analog Pressure sensor"
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There are however a number of challenges: | There are however a number of challenges: | ||
1 If you want to measure pressure in Bar, how is it converted from PSI | 1 If you want to measure pressure in Bar, how is it converted from PSI | ||
| − | 2 How can voltages higher than 3.3 volts be measured with the on-board ADC | + | 2 How can voltages higher than 1.0 or 3.3 volts be measured with the on-board ADC |
3 How can you make sensible readings with ESPEasy | 3 How can you make sensible readings with ESPEasy | ||
| + | Ad. 1 With one of the many freely available converters on the internet, you can easily discover that 1 Bar (100.000 Pascal) equals to 14,5037737796859 PSI (pound per square inch) | ||
| + | |||
| + | Ad. 2 It only takes a simple network of resistors to match measured voltages to the input specifications of the ESP8266 | ||
| + | |||
| + | Ad. 3 This takes some calculation. | ||
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Revision as of 23:02, 9 September 2016
When you want to measure pressure of liquids like oil or water, you could buy one of the pressure sensors on the internet, like this one:
It is very easy to install, has an analog output and a linear conversion. There are however a number of challenges:
1 If you want to measure pressure in Bar, how is it converted from PSI 2 How can voltages higher than 1.0 or 3.3 volts be measured with the on-board ADC 3 How can you make sensible readings with ESPEasy
Ad. 1 With one of the many freely available converters on the internet, you can easily discover that 1 Bar (100.000 Pascal) equals to 14,5037737796859 PSI (pound per square inch)
Ad. 2 It only takes a simple network of resistors to match measured voltages to the input specifications of the ESP8266
Ad. 3 This takes some calculation.
