Nuts and Volts

www.nutsvolts.com/index.php?/magazine/article/june2013_SmileysWorkshop

Sch. Part Description SparkFun Part # Part1 Arduino DEV-11021 U1 ATmega328P COM-09061 Q1 Crystal 16 MHz COM-00536 S1 Mini pushbutton COM-00097 C1,C2 22 pF capacitor COM-08571

R1,R1,R3, 1K ohm resistor COM-08980 LED1 Red LED COM-00533 LED2 Yellow LED COM-00533 LED3 Green LED COM-00533

Table 1. ArduinoISP on a proto shield — Bill of Materials.

You can use this information to wire up an Arduino proto shield breadboard as shown in the Fritzing view in Figure 5. As mentioned, the Fritzing schematic is shown in Figure 4 and the Bill of Materials for this design is listed in Table 1. In Figure 6, we have a photograph as proof that I really did build this thing on a proto shield breadboard. And, yes, it works. Finally, Figure 7 shows the components ported from the breadboard to the proto shield PCB for a more robust system — something you'll need if you use the ArduinoISP a lot.

You should be able to build this circuit following the schematic and the breadboard views. One thing to note is that ICs are shipped with their pins spread wider than the 0.3 spacing of the socket width. This is because they are usually inserted with a tool that squeezes them to the correct width before inserting them in a socket. When you

■ FIGURE 5. Fritzing ArduinoISP with proto shield.

go to put the ATmega328 in the breadboard, you'll find the pins flare out too much. So, very carefully bend them in a smidgen by holding the IC and pushing the pins sideways against a table. This is a craft, not a science. So, experiment carefully. You don't want to bend the pins more than once since they will break.

You can use the regular Arduino proto shield kit available from the Nuts & Volts web store as the basis for this project, but you might also consider getting the