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Serial bus Raspberry Pi to multiple AVRs
Background: I’m trying to replace the electronics for a ice hockey scoreboard. The old electronics had the following issues: It stop working. I have since discovered that a couple of diodes and...
View ArticleNon-inverting version of EL7232? (High-frequencey 3-state DIP driver/buffer)
I’m driving a large number of parallel UART inputs from a single UART output, at 2 Mbit. Currently, I’m driving with a Atmega32u4 using a 70 Ohm current limiting resistor (which in theory would allow...
View ArticleWhy SATA is simplex even though it has separate TX and RX pairs?
Why is SATA simplex even though it has separate TX+/- and RX+/- pairs? Why can’t it be full-duplex like SAS (which has the same interface with multiple ports and is full-duplex). If I am wrong with...
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Connecting RS-485 devices transparently
I have a main computer that has a RS-485 board. It communicates with its sub systems via this comminication board. I have also a test computer thas connected to main board via RS-485 channel. It will...
View ArticleParallel port as TTL serial
Is it possible to use a parallel port (a real one, not an USB converter) as a TTL serial port equivalent, for a maximum speed of 115200 baud ? I’d like to talk to a router’s serial port but I don’t...
View ArticleCan I an RS422 interface to Arduino's serial pins?
I have a custom-designed circuit that communicates to and from the external world through an RS422 interface. I wish to communicate with it with an Arduino, preferably UNO. The RS422, much like the...
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How can I scan an One-Wire (1-Wire) bus for all connected devices and list...
I have written a One-Wire (1-Wire, OW) controller in VHDL for FPGA designs. Currently I use a USB-OW adapter from Dallas/Maxim on my PC to get the sensors’ IDs. I would like to scan the bus directly...
View ArticleWhat is the difference between MibSPI and SPI?
The following text is from the TI TMS570LC4357 microcontroller features overview: Five Multibuffered Serial Peripheral Interface (MibSPI) Modules MibSPI1: 256 Words with ECC Protection Other MibSPIs:...
View ArticleProtocol used by tankless water heater remote control
I’m using an EcoSmart ECO 11 electric tankless water heater in a hydronic system. This heater has a “Remote Control” port on the side. The port is an RJ-11 jack with 4 wires. I want to interface this...
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