All Questions
Tagged with measurement microcontroller
41
questions
1
vote
1
answer
112
views
Grounding issue causing problem with capacitive soil measurement
I am using a MonkMakes board to measure the wetness of some soil in a pot. This board measures the capacitance of the soil, converts this into a wetness percentage, and sends this value to the ...
- 113
0
votes
1
answer
175
views
Replacing the mechanical switch with digital that has low on-resistance
Please take a look at the picture below.
What I am trying to do is designing a "switch" that can close the circuit so that the resistance meter can measure the resistance of the resistor. I ...
- 175
0
votes
1
answer
315
views
How can I measure 400 kHz frequency?
I would like to measure a 400 kHz sine wave.
I am thinking of converting the 400 kHz sine wave to a square wave using a Schmitt trigger and then measuring the signal with a microcontroller. Yes, the ...
- 195
0
votes
3
answers
966
views
Measuring voltages with different ground reference
Background
I am working on a project where I have a solar panel connected to two battery chargers.
One battery charger looks after an old car battery which powers some lights in my garage and a small ...
- 183
1
vote
0
answers
402
views
HX711 zero factor
I have three load cells (YZC-1B). These load cells' capacity is 50 kg. I guess I use Bogde's HX711 library.
In monitor, the zero factor for the first two load cells is 8,000,000, but for the last load ...
- 23
3
votes
2
answers
103
views
Measure voltage of motorcycle battery which varying voltage
I want to measure the voltage of my motorcycle battery using an microcontroller (ST32F401CE). The voltage from the battery is not a static value, since when riding, it'll be (according to the service ...
- 63
1
vote
1
answer
608
views
Testing QSPI Setup time and Hold time
I am having a QSPI Interface (operated in SDR mode) from this QSPI chip to MCU chip. QSPI lines :
QSPI CLK
QSPI CS
QSPI_IO0
QSPI_IO1
QSPI_IO2
QSPI_1O3
VSS
VDD
I am trying to validate the QSPI Setup ...
user220456
0
votes
1
answer
477
views
Measure Power Consumption of Battery Charger?
I want to ask how to measure power consumption of battery (Li-On 18650) charger module (TP4056 and USB Boost) and the total power consumption, if i have this circuit:
I have already know the power ...
- 45
1
vote
1
answer
88
views
Voltage Measurement with ST Microcontroller
I want to measure DC voltages from 1mV to 10V.
I will be using STM32L053C8T6 Discovery board.
I want to use 3.3V reference voltage. I know that if you want to measure voltages bigger than reference ...
0
votes
1
answer
2k
views
Measuring phase shift between current and voltage with microcontroller
I am trying to understand how this design is used to measure phase shift between current and voltage of an AC signal. From my understand there should be a PWM signal generated on the output. Resistors ...
- 23
3
votes
1
answer
720
views
Zero-crossing in AC with DC offset signal
Introduction
I have a project about measuring the voltage, current and power factor of an electrical system. I had designed a system that allows the microcontroller to measure the peak of an AC with ...
- 465
0
votes
1
answer
429
views
Problem with mesuring value from current sensig pin on VNH2SP30
I connected the Monster Motor Shield (based on the VNH2SP30) to the Arduino Uno and successfully drive the engine, but I can not measure the value from the CS pin on this board (the voltage at this ...
- 101
0
votes
2
answers
1k
views
Multiplexing of resistance measurements
I'm designing a circuit that requires me to measure three low value (8-60 ohms) resistors with a hard wired common connection on one end. My ADC doesn't have enough inputs to measure all three at once ...
- 316
0
votes
2
answers
2k
views
Measuring 0.1mm accuracy of very short distance (< 5 or 10mm)
I need to measure a very short distance (< 5 or 10mm) of a rotating shaft which will eventually move to one side by a few mm.
I would connect this to an Arduino or similar.
Could someone recommend ...
- 123
0
votes
0
answers
623
views
Poor man's capacitance meter with range control
I'm interested in making a capacitance meter with on-hand parts. Rather than connecting a bare microcontroller I'm inclined on using my Arduino Mega, since it has a built-in power supply and USB ...
- 3,229