added displays

hardware.md

@@ -43,6 +43,14 @@ There are a number of sensors that can be used for environmental sensors but it
 | _Hydrogen_                                 | _MQ-8_       | -                     |
 | _Carbon Monoxide, Coal Gas, Liquefied Gas_ | _MQ-9_       | -                     |
 
+## Displays
+
+As part of this project you may want to add a screen to display useful information such as the IP address etc.
+
+| Display                 | Interface | Tutorial              |
+| ----------------------- | --------- | --------------------- |
+| SSD1306 I2C OLED Screen | I2C       | https://goo.gl/idmyaz |
+
 ## Equipment List
 
 **You will be provided with kit** to use during the project however you may wish to purchase your own resources, below you can find a full costed kit. Prices and links are for Amazon but you can find these a lot cheaper if you shop around and you may be able to find some of this kit in the electronics lab (ask the supervisor in the lab first).
@@ -79,6 +87,7 @@ Your trip organisers can provide your team with the following components.
 | [UV sensor KS-204 GUVA-S12SD](http://amzn.eu/5KNJy0x)          | £5.29 |   5 |
 | [Dust sensor GP2Y1010AU0F](http://amzn.eu/5xqZT1y)             | £8.76 |   5 |
 | [GY-NEO6MV2 NEO-6M GPS Module](http://amzn.eu/j07kOl8)         | £5.99 |   5 |
+| [0.96 ssd1306 i2c OLED](http://amzn.eu/g3Be2pk)                | £6.99 |   5 |
 | [Multimeter](http://amzn.eu/gMtjFrh)                           | £3.82 |   2 |
 | [USB voltage/current meter](http://amzn.eu/0Hdmuff)            | £3.99 |   2 |
 | [ESP8266 ESP-12E module](http://amzn.eu/b9CUYlZ)               | £2.03 |   2 |