New answers tagged raspberry-pi
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Separate two batteries getting charged by one charger with diodes?
You need to understand function of each component.
BMS, protect battery Over-charge, over-discharge and over current. Some BMS also balance cells.
Balancer,(Passive or active) Passive balancer will ...
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Separate two batteries getting charged by one charger with diodes?
You cannot isolate the voltage sources using the diodes because what will end up happening is that 1 voltage source(the lower one) will source much less current than the other voltage source(the ...
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MAX3232: Switch between RS-232 and TTL levels
Electrically, you can use a single interface circuit like that shown below to accept an RS232C voltages or TTL voltages.
When RXD is approx. >0.7 V, the Q1 base diode clamps R1 to something like 0....
- 17.6k
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MAX3232: Switch between RS-232 and TTL levels
An RS-232 receiver that just conforms to the RS-232 specification would not work with TTL signals. But the MAX3232 switching levels (0.8 V/2.4 V) are reduced to be compatible with TTL.
However, the ...
- 14.3k
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How does this RS485 transceiver work?
The board is very questionable, or at least it may be made for some specific non-standard purpose, as there are many things that are not typical for a standard RS-485 interface.
It is possible that ...
- 87.1k
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Accepted
How does this RS485 transceiver work?
The normal (idle) state of the Pico UART output is high; this turns the transistor on through R1 or R11, which disables the transmitter (DE low) and enables the receiver (/RE low). Received data ...
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How does this RS485 transceiver work?
An RS-485 bus has three states: high, low, and idle. An UART signal has two states: high and low; when the UART is idle, the signal just stays high. It is therefore not possible to reliably control an ...
- 14.3k
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How does this RS485 transceiver work?
For 4-wire (full duplex) RS485 between two devices, all you need is really TX and RX. The driver is permanently enabled.
For 2-wire (half duplex), you need three GPIO pins: driver enable, RX, and TX.
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CE and FCC for MCU boards/Raspberry Pi HATs/Arduino shields etc
Have spent a lot of time researching this recently and wanted to add to this
You can see that on the official Arduino site, the genuine article does have the CE and FCC markings and you can even see ...
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candump and cansniffer are working but cansend is not working on Raspberry Pi + RS485 CAN HAT (MCP2515)
Sounds like the message is not being acknowledged, and the driver is repeating it. Can you try sending a different message that someone on the bus will ack to test your hardware setup?
Also some more ...
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How to troubleshoot a (possibly fried) ws2812b led strip
To explain the other answer, typically if you short out the data input to a given IC, then often only that specific IC will be fried. The input buffer or circuit could burn out while the rest of the ...
- 70.7k
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How to reduce voltage with no earth?
Using a buck or SEPIC (Buck/Boost) converter would be the best solution if you must use your existing power supply. Check the power requirements on your Pi, the 7805 cannot supply that much power. The ...
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