Merge pull request #176 from sourcebots/andy-sp2021

Add some images

Author: jefftheprogrammer

content/api/touch.md

@@ -2,6 +2,8 @@
 title: Touch Sensors
 weight: 7
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+
+![Touch sensor](/img/api/touch-sensor.png?width=600px)
 
 Microswitches, or touch sensors, are used to measure when something is touching the sensor.
 

content/api/ultrasound.md

@@ -2,7 +2,9 @@
 title: Ultrasound Sensors
 weight: 7
 ---
- 
+
+![Ultrasound sensor](/img/api/ultrasound.png?width=300px)
+
 Ultrasound sensors can measure distance of objects from the sensor. Ultrasound sensors emit a pulse of very high frequency sound, and measure the time it takes to hear an echo, typically Ultrasound sensors have electronics on the sensor to decide when an echo is received, and reports back a number as the distance in meters.
 
 Ultrasound sensors measure distance in a 18 degree diameter cone in front of the sensor, and report the closest measured distance in that cone. Ultrasound sensors also have a maximum distance. (Ultrasound sensors typically also have a minimum distance too, but we do not simulate that in our simulator).

content/robots/crane.md

@@ -3,6 +3,8 @@ title: Crane Robot
 weight: 2
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+![Crane robot](/img/robots/crane-isolated.png)
+
 The crane has three [linear motor](/api/motor-board), allowing it to move its [electromagnet](/api/magnet) in 3 dimensions. Each motor has an [encoder (position sensor)](/api/encoder) that can tell you the position of the motor along its track.
 
 Additionally, the crane has one ultrasound distance sensor and a radio, both attached to the hook (see below).

content/robots/forklift.md

@@ -3,6 +3,8 @@ title: Forklift Robot
 weight: 1
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+![Forklift robot](/img/robots/forklift-isolated.png)
+
 The forklift has two [radial motors](/api/motor-board), allowing it to move itself around the arena. It also has 2 grabber motors, wired so they move together. Each motor has an [encoder (position sensor)](/api/encoder) that can tell you either the position of the motor along its track, or its angle relative to the start.
 
 The forklift robot also has multiple Ultrasound sensors, a touch sensor, and a radio, see below for details.