Unanswered Questions
29,153 questions with no upvoted or accepted answers
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STM32 - I²C Slave HAL Callback ACK
Objective: implement a single byte I²C slave on STM32.
Materials: STM32L452RE Nucleo-64 board, HAL Library, CH341 USB-I²C adapter(1), Artix Linux with Runit, Rhode & Schwarz RTB2004 oscilloscope
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Custom RP2040 PCB Not Detected by PC
I designed a custom RP2040 to control some 24V LED strips. The official hardware design guide from the Raspberry Pi Foundation is what I followed for my design. It was then sent out to JLCPCB for the ...
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Breaking capacity for fuses at mains inlet
Is there any official guidance as to what the breaking capacity should be for a mains inlet fuse? Assuming the appliance is intended to be fed from a normal domestic socket.
I understand that in an ...
CommunityBot
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Is LTC2485 Arduino library missing information?
I'm using LTC2485 and got confused by the provided software code vs. the datasheet.
As described in LTC2485 I2C Data Format the LTC2485 ADC is 24 bits + sign ADC so like 25 bits.
In the given software ...
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What is the upper frequency limit for an op-amp integrator?
I'm designing a circuit to process a di/dt signal. As the input is the differential of the measured current, I have to integrate the voltage to provide a representation of the current. The duration of ...
Null♦
- 7,623
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Cannot find what causes faults on DRV8353RH
I keep getting faults on a a new batch of ESC boards based on the TI DRV8353RH & Infineon IPT020N10N3ATMA1. Please consider:
When starting a motor at 48V - 56V the DRV asserts a fault after ...
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Invisible magic components that spoil the Eagle preview
You know, after the eagle board design is finished, you can see the card on the preview screen.
I'll show you two examples. There is no problem with one. The card is centered on the preview screen.
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Detection of CT secondary subsidence current
In utility power system protection we have a protection function called "breaker failure" protection. This protection is used to take appropriate action if/when a circuit breaker fails to ...
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Drift with Madgwick algorithm with fast movements
I am trying to correctly track orientation of a sensor with accelerometer and gyroscope using the open source Madgwick algorithm. The algorithm returns quaternions which represent the rotation between ...
- 175k
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What complications arise when designing a USB device sharing switch?
I wish to design and build a USB switch capable of transferring one USB keyboard between one of two computers. I wish to automate the process of unplugging the device from host A and plugging it ...
- 151k
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Potential issues with mounting tiny PCB directly to piezo transducer?
I am designing a very small signal conditioning daughterboard with the intent of mounting it directly underneath a cylindrical piezoelectric force device/"sensor" to rectify and filter the ...
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SD card SPI initialization Check Pattern Fail
I'm trying to interface a Swissbit 512MB (S-450u Series) SD card (datasheet here) with an ARM microcontroller through the card's SPI interface. The datasheet for this card says it's fully compliant ...
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RFID reader array using row/column RF switches (multiplexers)
I need an 8x8 grid of RFID readers arranged on an 8"x8" board. The RFID tags will be placed only millimeters above each antenna.
I was wondering if I could use one 1:8 RF switch (e.g. pSemi PE426482) ...
CommunityBot
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ATTiny85 clock speed problem
Using an ATTiny85 and an Arduino loader I created a simple device for turning on an exhaust fan based on a light sensor. The ATTiny85 turns on the fan after activating a warning light and sounding an ...
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What is the relation between resonance frequency and piezoelectric charge coefficient?
We know that the maximum power is lost at the resonant frequency,where the impedance is minimal. On the other hand, when the impedance is minimized, the charge coefficient is maximized. In resonance ...
- 175k