I am trying to add a 5th wire for the SPI bus on the rapsberry pi. This will be an RX load wire that turns on an off every 6 SCK cycles. Is the easiest was to do this to just add an extra wire for each spi in the device tree and then edit the spidev driver or is there something else that has to be done?
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I want to connect an STM32F407 Discovery board with a Raspberry Pi 4 Model B.
And I want to use UART as communication so I plan to use PD5&6 on STM32 and Pin8&10 on RPi. But after looking up online it says that the voltage of a STM32 port is 5V and RPi is 3.3V, so it seems that I need a level converter between them?
And there are also some articles says that not all the STM32 port are 5V, some are 3.3V. But I cannot find any of that information in the datasheet. Can anyone tell me where can I find these information?
Thank you very much ~ ~
The STM32 uses 3.3V as well. But it's 5V tolerant.
Just go ahead and connect them. There is no voltage difference.
You should have a look at the reference manual for that discovery board. It is here: STM32F407 Reference Manual.
There should be no issue connecting UARTs between those boards. Just remember to connect the TX from one to the RX of the other and vice versa. You can also use the CTS/RTS for flow control, but that isn't necessary as long as you are using baud rates of 115200 or slower.
Something else that I would recommended is to power the Raspberry Pi from the Discovery board. There should be pins for suitable power on the discovery. This is important because it gets both boards using the same power and ground so that the UART logic levels are consistent between the two. This may not be necessary, but I have had issues trying to connect two Nucleo boards SPI busses together if I didn't power one board from the other.
I just designed my first STM32 PCB board for STM32L476RG flashed it and tried to test it with togglePin. However multimeter doesn't show anything.
Here is the design for the STM32
I use nucleo board as a programator by unplagging jumpers and connecting jumper cables to debugger on the PCB board (so that computer can see the stm board)
I use LDO 5V to 3.3V for a power supply to stm32
Here is my settings for stm32 debug:
Although I designed a PCB for JTAG, for flashing microcontroller I use SWD just with JTMS and JTCK
-Here is my clock configuration (i am not using any additional crystal):
I assigned gpio pins as Output in CubeMX but non of them are not going HIGH.
Any thoughts on that? Or what can I possibly do?
Since MQ-3 sensor provides analog output, we have got MCP 3008. We tried to make the connections with Raspberry pi 3 using the connections from MQ-2 sensor available online. Nothing works! Need help to interface MQ 3 with Raspberry pi 3 for detecting Alcohol Level
this link is best to interface analog sensor with raspberry pi
https://tutorials-raspberrypi.com/configure-and-read-out-the-raspberry-pi-gas-sensor-mq-x/
use this link but if you want use analog sensor with raspberry pi so you need another ADC module or another chip like PIC , ATMEGA 32
I'm trying to connect multiple devices to my Raspberry Pi 3 B+. The components are RFID RC522, RPi LCD display, Load Sensor (strain gauge), and WiFi shield. All those are needed for my project. However GPIO pins overlap almost in every case. I do know that we can parallel the Voltage pin, however I'm super confused how to connect all of it on 1 board. If there's a channel splitter hardware solution or an extended version of RPi or in few words - what's the best way to do it - if possible. Thanks!
I couldn't find the right pictures for weigh sensor with HX711 and wifi shield, but all those need pins.
I think you should look into the MCP3008 ADC (analog to digital converter) as the raspberry pi has no analog gpio pins and it will allow you up to 8 analog sensors to be attached via 4 wires to the Rpi using SPI, For powering things use a breadboard rail to power your sensors from the Rpi but other gpio pins output 3.3v, to get more gpio pins use an MCP23008 chip through I2C. if you're using a Rpi 3 it has built in wifi or you can get a usb wifi antenna.
I am trying to connect an analogue to digital converter to the raspberry pi. As far as I am able to understand, the RPi doesn't support Bi-directional SPI mode. The adc I am using says it is SPI compatible but only has the inputs SCLK, CNV and outputs CLKOUT+ and CLKOUT- and SD0+ and SD0-. This leads me to understand that it will only work with bi-directional SPI as there is only the serial data out. I am thinking of using a PWM for CNV (which I think CE), GPIO clock for SCLK and then an interrupt on the falling edge of the GPIO clock to just digitally read each bit from the adc. I don't understand SPI in detail but from what I've read quite often it requires sending data in order to receive it. Do you know if the setup I mentioned (without using SPI) will work? Or am I missing something about SPI and the adc will work with that while not in bi-directional mode?
We are using the Raspberry Pi 3 b
adc - http://cds.linear.com/docs/en/datasheet/232316fa.pdf
Thanks for any help you can provide.
Read the data sheet carefully, in particular pages 8 and 9. I suggest that you tie CMOS/LVDS pin to ground to enable CMOS mode. Then use only the "+"-pins. Use the SCK for SPI clock, SD01+ for SPI data input to the Rpi. Connect a GPIO pin to CNV.
Also observe that the RPi runs at 3.3V, and the ADC's max rating is also 3v3, that is running the IC right to the edge.