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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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0 votes

In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m?

An LDR senses light, not distance. I guess you want to make a light beam consisting of a light and an LDR, so you can detect when something blocks the light from getting to the LDR. An LDR can only ...
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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
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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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7 votes
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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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-1 votes

Why does the Arduino give me a value of 1023?

Connect the 2 grounds together .The 2 batteries form a circuit which doesnt have a return path inside the Arduino.
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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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0 votes

CNC feedback mechanism

Is there some kind of ongoing reality check other than stop switches to prevent out-of-bound travel? How does it work? Negative. Most GRBL stepper drivers are blissfully ignorant of "missed"...
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3 votes

Powering esp32 via v5 influences ds18b20 working (which is powered with 3.3v)

I've had the same problems with ESP32. First, read this answer and use the voltage translator circuit to run the sensors on 5V. That will give you much better noise immunity. Second, the onewire ...
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