Cvshowimage not updating lajolladating com
Next, try a hot wire detector - loop of constantan wire used to heat a thermistor using a constant current source - the temperature above ambient should depend on the thermal properties of the gas surrounding it.Unfortunately I was using a 100R resistor to sense the current, and my loop of constantan is only about 1R.(It is also much more of a useful education project for Laura, but she didn't know that at the start).A gas chromatograph relies on a constant flow of carrier gas passing through a 'column', which is in a temperature controlled oven.The infrastructure part went well - we have a web interface to a three term temperature controller that works fine, and sends data back to the web server, which produces a graph of the temperature history.You can change set point, controller gains etc over the web interface.This means that the 12V power supply only has to go to the oven, and we can provide a 5V switching signal from the arduino to control the heater using the transistor: Heater plate with resistors attached, along with power transistor to control the heater current.Note that we had to disconnect the transistor heat sink from the plate because grounding it to earth switched on the transistor, so we had an over-heat fault on first commissioning - the arduino tried to switch off the heaters, but they continued at full power - at least we proved that we can get the oven to just over 90deg C...
Although some people use Arduino's for this, I thought it would be much easier to use a Raspberry Pi.
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