Whilst every effort was taken prior to publishing, some errors may feature in the book. This page aims to correct them.
Page 21 – In this instance TTL refers to Transistor-Transistor Logic rather than Time To Live.
Page 46 – There is an unconnected red wire shown in the Fritzing diagram that is not required.
Page 48 – In the Fritzing diagram the black GND wire for the LED should be connected to the cathode of the LED as above. The image of the switch resistor is 220 ohm rather than 10k ohm.
Page 52, 55, 61, 110 – The Fritzing diagrams in these pages show a 470 ohm resistor when the text refers to 220 ohms. Either will work fine but your LEDs will be brighter using 220 ohm resistors.
Page 57 – The GND wire in the Fritzing diagram should be connected to the Cathode of the LED as above.
Page 71 – Memory Game, in the Fritzing diagram the black ground wires on the buttons are connected to the incorrect pins. They should be opposite the LEDs as shown above. The photograph on page 70 shows the buttons wired correctly.
Page 77 – Lie Detector; in the Fritzing diagram the A0 connection should be on the sensor side of the resistor rather than GND as shown above. The RGB LED used in this project is referred to as common anode but is actually common cathode.