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I'm trying to build a smart house. To be smart, the house needs to know where people are located. Having all individuals to carry some sort of transmitter is not an option. I need the lights to turn on in the bedroom even if I'm wearing nothing but a towel.
To detect human presence I think...
Your advice is more than enough. A google search for "PIC SPI Bootloader" uncovered among others this information:https://legacy.nrao.edu/alma/memos/html-memos/alma414/memo414.pdf
Problem solved. The answer is: Yes, an established SPI bus will be sufficient.
I'm (trying) to design a CANbus node for my home automation project. Any given node consist of a main-board with a power supply circuit, a PIC18F26K80 and a demultiplexer to handle the chip select of up to 8 daughter boards.
A daughter board will at have a (small) PIC running in SPI slave...
I do agree polling would be the standard way to go.
The thing is I have to create a solution with very high focus on power efficiency. The network, when completed will have up to 200 nodes and it will be on 24/7. 90% of the nodes will just monitor some sensors and if the sensor...
It is a rs485 network. It is wired with cat5. Bus length max 100meters/300feet. 1 twisted pair for power, one for GND and one for rx/tx (The last pair is reserved)
Nodes will primarily be monitoring temperature, humidity, smoke detector, PIR etc. in a building.
I know I could implement...
Let's say I have 10 nodes/microcontrollers on the same data bus. The nodes are powered by the same power line (Was thinking 24v). I was wondering if I could use this shared power line to send a signal when a node wants to use the data bus.
I was thinking this:
1. When a node is turned on...
I have 4 PCB's with a microcontroller on each. The boards are identically in both hardware and software.
Now when powered on I would like MCU A to run subroutine A, MCU B to run subroutine B and so on. - so I need a way to tell each MCU what to run.
This could be done with at dip switch and a...
It'll be a single-master system.
Well, to save bandwidth and power. In a system where 99% of the traffic and a large part of the power consumption is "wasted" it just seamed a good idea.
(Haven't done the math on the power consumption part, just guessing)
That is a very good idea!
Adding a Master-Wake-Up signal to the rs-485 bus ?
I have a rs-485 network with one master and multiple slaves. A slave is only speaking if spoken to by the master.
Let's say I have a slave that monitors a sensor. If the sensor value gets outside a predefined range the master must be...