update

Author: MarcScott

buzzer.md

@@ -22,7 +22,7 @@ Set up the circuit as shown below.
 1. Add a line below your creation of `button` and `lights` to add a `Buzzer` object:
 
     ```python
-    buzzer = Buzzer(15)
+    buzzer = Buzzer(17)
     ```
 
 1. In gpio zero, a `Buzzer` works exactly like an `LED`, so try adding a `buzzer.on()` and `buzzer.off()` into your loop:

hardware.md

@@ -9,10 +9,10 @@
 - name: 1 x Tactile button
   img: tactile-push-button
 - name: 3 x LEDs
-  img: led.png
+  img: led
 - name: Ultrasonic Distance Sensor
-  img: ultrasonic-distance-sensor.png
+  img: ultrasonic-distance-sensor
 - name: Passive Infrared Motion Sensor
-  img: pir.png
-- name: LDR
-  img: ldr.png
+  img: pir
+- name: Light Dependent Resistor
+  img: ldr

hardware.yml

@@ -1,4 +1,4 @@
-# An LDR
+# A Light Dependent Resistor (LDR)
 
 ## Analogue inputs
 
@@ -24,7 +24,7 @@ By putting a resistor in series with the capacitor, you can slow the speed at wh
 
 If you time how long it takes the capacitor's voltage to get over 1.8V (or be *on*), you can work out the resistance of the component in series with it.
 
-## Light-dependent resistors (LDRs)
+## Light-dependent resistors
 
 An LDR (sometimes called a photocell) is a special type of resistor.
 

ldr.md

@@ -1,7 +1,5 @@
 # Traffic Lights
 
-![cover](images/traffic-lights.png)
-
 For this worksheet you'll need a breadboard, three LEDs, a button, a buzzer, and the necessary jumper cables and resistors. You can purchase these individually, or get eveything you need in [CamJam Kit 1](https://thepihut.com/products/camjam-edukit)
 
 ## Wiring

trafficlights.md

@@ -214,6 +214,6 @@ There are lots of other things you can control or monitor with your Raspberry Pi
 
 [Using an Active Buzzer](buzzer.md)  
 [Making Traffic Lights](trafficlights.md)  
-[Using an LDR](ldr.md)  
+[Using a Light Dependent Resistor](ldr.md)  
 [Using a PIR Sensor](pir.md)  
 [Using an ultrasonic distance sensor](distance.md)