Please recommend a cheap io expansion chip iic spi can be used for keyboard and led indication

bigbat

Please recommend a cheap io expansion chip iic spi can be used for keyboard and led indication [Copy link]

Please recommend a cheap io expansion chip iic, spi can be used for keyboard and led indication. MCP23017 is too expensive, about 10 yuan.

tagetage

PCF8574 74HC595 etc.

le062

3_CM32F060规格书_CAN_V0.4.pdf (2.45 MB, downloads: 2)

2022-2-11 10:55 上传

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This unknown microcontroller is very cheap, but you have to find the source and get the right price yourself. I don't control the source.

bigbat

tagetage 发表于 2022-2-11 10:24 PCF8574 74HC595 等

These two are more expensive than the MCP23017 I mentioned

tagetage

bigbat posted on 2022-2-11 15:09 These two are more expensive than the MCP23017 I mentioned

74HC595 0.1x yuan, is it expensive? ? ? ? ?

bigbat

tagetage posted on 2022-2-11 15:54 74HC595 0.1x yuan, is it expensive? ? ? ? ?

74HC595 can't be used, it is unidirectional and can only output

tagetage

bigbat posted on 2022-2-11 15:56 74HC595 This can't be used, it is one-way and can only output

Oh, you want a bidirectional one. Can you take a look at the Qinheng CH423S digital tube driver and keyboard control chip 1.x yuan?

bigbat

tagetage posted on 2022-2-11 16:00 Oh, you want a bidirectional one, can you take a look at Qinheng CH423S digital tube driver and keyboard control chip 1.x yuan?

Thanks, ok I'll go check it out

daemondong

You can take a look at TM1638, it is quite easy to use.