Week 11
Input Devices

Goal

Group assignment:

Probe an input device(s)'s analog and digital signals
Document your work to the group work page and reflect on your individual page what you learned

Individual assignments:

Measure something: add a sensor to a microcontroller board that you have designed and read it.

Learning outcomes

Demonstrate workflows used in sensing something with input device(s) and MCU board

Sample Headline

inked to the group assignment page
Documented what you learned from interfacing an input device(s) to microcontroller and how the physical property relates to the measured results
Documented your design and fabrication process or linked to previous examples.
Explained the programming process/es you used
Explained problems and how you fixed them
Included original design files and source code
Included a ‘hero shot/video’ of your board

The input device

Fro this week i will use a color sensor to find the color of an object

Datasheet

I will also use a small screen to show the data from the sensor

the both device use an I2C interface

But What is an I2C interface

I2C (Inter-Integrated Circuit; pronounced as “eye-squared-C”), alternatively known as I2C or IIC, is a synchronous, multi-master/multi-slave (controller/target), packet switched, single-ended, serial communication bus invented in 1982 by Philips Semiconductors. It is widely used for attaching lower-speed peripheral ICs to processors and microcontrollers in short-distance, intra-board communication.Several competitors, such as Siemens, NEC, Texas Instruments, STMicroelectronics, Motorola, Nordic Semiconductor and Intersil, have introduced compatible I2C products to the market since the mid-1990s.System Management Bus (SMBus), defined by Intel in 1995, is a subset of I2C, defining a stricter usage. One purpose of SMBus is to promote robustness and interoperability. Accordingly, modern I2C systems incorporate some policies and rules from SMBus, sometimes supporting both I2C and SMBus, requiring only minimal reconfiguration either by commanding or output pin use.

Sketching

The idea is to press the PCB on an object, a botton (black) will be press against the surface to activate few white LED ( yellow) and the color sensor (purpel).

PCB Design

Knowing that i can design the PCB like in the week 6.

I have different groupe

On the top i have the core, with the Xiao RP2040, our brain.
Because i will use the I2C protocol i need to connect the color sensor and the screen on the pin P6 SDA and P7 SCL for the communication.

I have also the botton connect to the pin P4
and the adressable LED on pin P2 to reproduce the color we find.

Under i have defferent groupe, the LEDs, the ground connection for the holes for the stand off.
But also the color sensor, the principale sensor here.

Week 11 ​​​​​Input Devices