Additional examples for specific h/w by our interns

[kilograham]

adc/microphone_adc - Read analog values from a microphone and plot the measured sound amplitude.
i2c/bmp280_i2c - Read and convert temperature and pressure data from a BMP280 sensor, attached to an I2C bus.
i2c/lis3dh_i2c - Read acceleration and temperature value from a LIS3DH sensor via I2C
i2c/mcp9808_i2c - Read temperature, set limits and raise alerts when limits are surpassed.
i2c/mma8451_i2c - Read acceleration from a MMA8451 accelerometer and set range and precision for the data.
i2c/mpl3115a2_i2c - Interface with an MPL3115A2 altimeter, exploring interrupts and advanced board features, via I2C.
i2c/oled_i2c - Convert and display a bitmap on a 128x32 SSD1306-driven OLED display
i2c/pa1010d_i2c - Read GPS location data, parse and display data via I2C.
i2c/pcf8523_i2c - Read time and date values from a real time clock. Set current time and alarms on it.
uart/lcd_uart - Display text and symbols on a 16x02 RGB LCD display via UART

[lurch]

@kilograham Looking at the changes between #169 and this PR, have you accidentally picked up a bunch of "old versions" of the interns' PRs?
e.g. in #135 (the original microphone_adc PR) and #165 and #169 in adc/microphone_adc/microphone_adc.c it says:

#define ADC_PIN 0
#define ADC_VREF 3.3

but in this PR it says:

#define ADC_NUM 0
#define ADC_PIN (26 + ADC_NUM)
#define ADC_VREF 3.3

Or have you (deliberately) made your own changes on top of the interns' code?

Most of the changes between #169 and #171 appear to merely be whitespace-changes though.

[kilograham]

Or have you (deliberately) made your own changes on top of the interns' code?

sorry, yes i made some changes in passing.

[liamfraser]

General quality looks pretty good to me. They all compile. Don't have the hardware to test they work in practice.