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  (text "Current is set as follows :\n- 100mV across 22R = ~4.54mA. MOSFET used to avoid influence from additional base current.\n- For fuel level and common sensors (0-250Ohm), that gives a sensor voltage of anywhere between 0 and 1.135V\n- Practically the maximum voltage that can be is 4.9V-0.550V = 4.35V (the schottky typical Vf, although usually lower)\n- That means that in this current setup the maximum limit for sensor resistance readout is approximately 950Ohm\n- There is a 5 -> 3.3V divider for the ESP32 ADC using a resistor divider. This accounts for when no sensor is attached."
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  (text "Ideas/issues : \n- How to account for variations in the Vf of PMEG3010EH\n	Alex: At ~4.5mA, Vf varies by ~120mV from -40 to 80degC. This equates to ~24ohm error over a large temp\n	Martin : gotcha\n- 5V may not be true 5V -> Zener regulator there too ? evaluate possible swings\n	Alex: Used a Vref that follows any variation of 5V. More worried about keeping a set V across the current set resistor.\n- Design is a bit limited to be usable on >750Ohm sensors like ECU sensors\n	Alex: Could be used for sensors up to 900ohm. We could look to add configurable range switchig future versions.\n	Martin : Currently I am reserving one I/O for higher impedance sensors. I guess increasing the Iset resistor is also a method, for example to 51R?\n- Something better than PMEG3010EH to use ?\n	Alex: At ~4.5mA, Vf is only ~200mV which is pretty good!\n- No issue with Vset being so close to the Vcc for the LM358? I got a bit confused by the datasheet."
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