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Why does the Arduino give me a value of 1023?

read data from the sensor it always shows 1023 values The TL084 amplifier on the board is powered by the +- 9V rails. This means that the output (SIG) could be above the 5V that are powering the ...
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2 votes

Grounding sensors to large bodies

You can design SMD signal diodes on FPC strips with 3M thermal tape instead of thermistors then use analog Mux to an INA differential amp to reduce EMI with a 0.1 mA and use the diode thermometer ...
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1 vote

Connect analog sensor to PLC Omron CP1E-E30SDRA

The direct way should be to add an analog module, but also it is posible to use an analog to frecuency converting module. There are standard adapters for voltage/current (0/4..20 mA) signals to ...
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  • 732
1 vote

Resistive Moisture Sensors, What is the purpose of the 2N3904 Transistor in the Sparkfun Circuit?

The sensitivity will be higher by a factor of more than 100 (typically) with the transistor due to the current gain of the transistor. That means slower corrosion of the sensor as well. Both circuit ...
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1 vote
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GMR Sensor voltage output into magnetic field

These sensors have bridge configuration, so their sensitivity is relative to supply voltage. In the datasheet (page 13) it is written that they are separated into groups by sensitivity. It is measured ...
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  • 176
1 vote

Why am I getting inconsistent voltages at op-amp's inputs in a simple DC amplifier?

Now I see an 8 mV discrepancy between the inputs when they're measured relative to ground, but if I measure directly across the inputs, I measure a 0 mV difference. This suggests that the circuit may ...
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1 vote

Interfacing TDC sensor (inductive pickup) to a microcontroller

I've worked with these before and I get away with using pretty vanilla op-amps or comparators as the voltage from the sensor is rather large. Here's a sample I just made with a Toyota 4A-GE 20V ("...
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  • 620

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