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thermistor_troubleshooting [2016/04/16 17:35] Traumflug [Check Thermistor Wiring] |
thermistor_troubleshooting [2018/05/27 16:10] (current) |
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| This measurement can be done without the processor installed. If one is installed, the firmware shouldn't make these pins an output, but keep the default, input. | This measurement can be done without the processor installed. If one is installed, the firmware shouldn't make these pins an output, but keep the default, input. | ||
| - | Without a thermistor connected, both pins should read full 3.3\_volts (5\_volts on 5\_V controllers). Connecting a thermistor at room temperature should drop this not much, but a bit. Typically to 3.1\_... 3.2\_volts. | + | Without a thermistor connected, both pins should read full 3.3\_volts (5\_volts on 5\_V controllers). Connecting a thermistor at room temperature (not to these processor pins, but to the thermistor header on the board) should drop this not much, but a bit. Typically to 3.1\_... 3.2\_volts. |
| Warming the thermistor by hand might change that slightly, perhaps by another 0.05\_V drop. Warming the thermistor with a lighter or soldering iron (be careful to not overheat it!), should drop that voltage further, down to very low readings, like 0.5\_V. | Warming the thermistor by hand might change that slightly, perhaps by another 0.05\_V drop. Warming the thermistor with a lighter or soldering iron (be careful to not overheat it!), should drop that voltage further, down to very low readings, like 0.5\_V. | ||
thermistor_troubleshooting.txt ยท Last modified: 2018/05/27 16:10 (external edit)
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