Matrix user forums

When you're using SPI HW module in the controller, the module will dominate the MOSI, MISO, SCK pins. In this case, if you're not using MISO pin, you can use it as a digital input, but only as a digital input. The corresponding bit of the PORT register (in PIC microcontrollers) can be read and it wi...

jgu1, what is the solution? I didn't found it.

I've tested these RF modules and I can't recommend it. If the transmitter doesn't send any data or the transmitter input is in L state, the receiver output goes crazy. Receiver_output_1.jpg Receiver_output_2.jpg I have no idea, how they deal with this crazy signal in projects like this: https://rand...

Chaining is easy. If you can controll one 74595, you can controll lots of them. First, you have to decide, how many 595 meets you specification. One 595, one byte of data. Eg, you have three 595. First sent out byte goes to the last (3rd) 595, second goes to the middle (2nd) and the last sent out da...

What is your I2C slave device? Be careful, different devices most of the times needs different type/sequence of commands.

Maybe there is a bug in the UART1 interrupt macro. To test it, create a new and small program.

For example, Timer1 interrupt flashing an LED on port RA0. If it's working, step forward. Timer1 and UART1 interrupt and test it again in real HW.

Sorry guys, forgot the example. Here it is, tested on real HW. Flowchart written in Flowcode v6 (I don't have newer), but you can find the required C codes in the report file.

If you know the ROM codes, there is no problem:

bus reset
match ROM
[send ROM code]
convert
...

The original problem:

I could connected one sensor at a time, and register there rom code but there must be another way of doing this.

If you're smart enough, you can do it: https://www.maximintegrated.com/en/design/technical-documents/app-notes/1/187.html Please don't ask me anything about it, i don't understand how it's working (my primary language is not english)... Maybe the GetDeviceCount will help, but test it before using. O...

Try to use different controller, where Timer 1 extended with Gate Control. Eg.: PIC18F26K22, PIC16F1825. If you're using Gate Control in Single-pulse mode (see datasheet), you have to do only three things: set T1GGO bit, wait for measure complete, read TMR1H and TMR1L registers to get the time. Only...

Hello!

Searc for: ir remote decoder module. eBay, Amazon, AliExpress etc.

If you know how UART (RS232) is working, try IR remote decoder module. Works fine and it has UART input and output. I've tested all IR remotes at home, it's sees all one of them.

Today I've learned a new trick. :) Setup the ADC: Vref+: Vdd (AVdd) Vref-: Vss (AVss) Setup FVR to 1.024 V Measure FVR voltage by the ADC module. Because FVR is fixed, you can calculate the PIC's own voltage. Tested with PIC18F14K22, surprisingly accurate. Important! With this PIC, using 1.024 or 2....

Yes, you need a fixed reference. It can be external or if you choose another controller (eg. PIC12F1840), can be internal.

I don't recommend zener diode as a voltage reference, it's not stable.

It's not as simple as it looks. The first problem is the display itself. It' containing built-in charater set. Until today, I've seen three types: Code J.png Code E.png Code C.png Let's see Code E table, "É" character (top row, around middle). The datasheet says, binary code is HHLL LLLL = 0b1100000...

1 MHz interrupt is extremly frequent to handle it correctly and use the MCU to other tasks. You should use a PWM output or a dedicated oscillator circuit.

Hello! First, let me recommend some PIC microcontroller for the future. Programming language like Flowcode, is very easy of use and fast but there is a price for this, the end program (the .hex file) is larger. To handle this, you need microcontroller with larger memory regions (RAM & ROM). If you m...

The RS232 (UART) module is a dedicated module, controlled by the CPU. The CPU "tells" to the UART module to send a character and continues executing the program. The CPU can handle the interrupt during UART data transfer while the UART module is still transmitting or receiving the data. Same results...

Hello! No, there is no option to measure negative voltage via simple microcontrollers, without extra analogue components. You can get negative results, if the controller have special ADC. Eg. PIC18FxxK80 family have differential ADC. The ADC module (optionally) have two inputs, positive and negative...

Maybe:

Don't use FLOAT, you don't need it. If you have a number what is needed to be increment or decrement by 0.1, multiply everything by 10. In this case, 1004 means 100.4 You have to make some tricks only if you want to display it as a Float. x=1004 (the original number, means 100.4) y=x mod 10 (y will ...

Working, thank you!

Sorry, i've forgotten an important thing, what is helped for me:

Hello!

Sorry to post here, didn't find suitable topic.

Can't delete private messages, got "The submitted form was invalid. Try submitting again." message from the forum engine.

Try to search for "openlog module", the easiest way to make data logger. You need only UART (RS232) communication, everything else is made by the module.