RS485 RS232 and all Serial for GPIO

Have been working on projects with GPIO to unusual sensors. Intermediate idea:

Let any more GPIO peripherals be SPI for now?

 

I looked around for sensors prepackaged SPI sensors in the SD form factor.

ala Horwoitz and Hill Chapter 15  with no luck...

 

See Chapter 15 of latest Horowitz and Hill - Art of Electronics.
  https://artofelectronics.net/ 

 

 Look particularly at the tables/diagrams of SPI and I2C peripherals.
 Table 15.20 p1080 All IO
 Table 15.21 p1083 SPI
 Table 15.22 P1085 I2C

 

One could use the 6x1 pin header Digilent PMOD Standard for SPI.

Digilent PMOD Getting Started

There are many PMOD sensors available COTS.

 

Put in a secondary SPI header/socket on the existing SPI bus. Use the GPIO for CS.

The CS would also control power to the sensor in the socket.

One could not talk to sensor and SPI memory at exactly the same time. But maybe no big drawback?

 

One could also do TTL RS485 or RS232 to a UART to SPI bridge ala FT9xx. (or similar) on a bigger daughter board. Again a GPIO would be needed for CS and power ON/OFF for the target sensor on the bus. In fact one would power up and down the whole FT9xx as needed to conserve power.

And Even Longer.... Security at Edge, Smart Toys

Doing post just to keep things alive. It seems it has been a year since trying to get started again.
Now interested in LoRa WAN. Still toys.... especially Lego and construction toys. Also smart toys.

Security for physical edge devices is more and more an important topic.
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