Please recommend a cheap and available microcontroller

littleshrimp

Please recommend a cheap and available microcontroller [Copy link]

 

 

I would like to ask for a cheap and available microcontroller that I would like to use for RS-485 data transmission for sensor data acquisition. It only needs to have I2C and UART functions, and no other resources are required.

q1967783230

Other needs, how cheap is it?

littleshrimp

q1967783230 posted on 2021-4-25 13:23 Other requirements, how cheap is the one you mentioned?

As cheap as possible, no other requirements

longqi2010

Is there a memory requirement? We have some.

freebsder

Is the shortage so serious?

dcexpert

ESP8266 can also be used as a general-purpose microcontroller.

大秦正声

You are the moderator of French and Italian chips, you should go to the conference in Shenzhen to express your demands!

littleshrimp

dcexpert published on 2021-4-25 17:29 ESP8266 can also be used as a general-purpose microcontroller.

It feels a bit wasteful to only collect temperature and send data

littleshrimp

Daqin Zhengsheng posted on 2021-4-25 17:50 You are the moderator of French and Italian chips, you should go to the Shenzhen conference to express your demands!

France and Italy, haha

I really want to use such a microcontroller, no kidding

littleshrimp

longqi2010 posted on 2021-4-25 16:05 Is there a requirement for the memory size? We have some stock.

What model?

cruelfox

“As cheap as possible” – How much will you use, and are you that sensitive to cost?

When selling things, you can reasonably raise the price when it seriously affects the gross profit.

littleshrimp

cruelfox posted on 2021-4-25 20:15 "As cheap as possible" - how much do you need to use? Are you so sensitive to cost? If you sell things, it will seriously affect the gross profit...

The main reason is that I don't have too many requirements for functions. I have some MSP430 microcontrollers, but I feel that the cost of 5 yuan per piece is a bit wasteful.

littleshrimp

cruelfox posted on 2021-4-25 20:15 "As cheap as possible" - how much do you need to use? Are you so sensitive to cost? If you sell things, it will seriously affect the gross profit...

Also, the pin count is 28, which seems a bit too many. It would be best if the size could be smaller, such as around 8 pins.

cruelfox

littleshrimp posted on 2021-4-25 20:36 Also, the pins are 28, which feels a bit too much. It would be best if the size could be smaller, such as around 8.

Go to the LiChuang Mall, sort by price under "Microcontrollers", and check the ones that are in stock.

Note that many of these bargains are OTP, so you probably won’t want them.

littleshrimp

cruelfox posted on 2021-4-25 20:53 Go to the LiChuang Mall, sort by price under "Microcontrollers", and check the ones that are in stock. Note that many of these cheap products are OTP, ...

It is indeed a solution. There are not many products with UART function. Finally, I found a SN8F570212TG, which seems to be okay.

grateful.

大秦正声

ch55x, has uart, no i2c

大秦正声

This is the stc kernel.

大秦正声

Daqin Zhengsheng published on 2021-4-26 09:10 This is the stc kernel

I checked the manual and it is flash. It can be used.

大秦正声

You need to purchase an SN Link to use it.

bqgup

The stc51 microcontroller is enough, it supports iic and serial communication, has 40 pins, supports external multi-sensor networks, and is very cheap