Start of Second Term
Today we started work with the toolkits. Each student has everything they need to work with solderless breadboards in a small case. The images are of the case I have been using for a few months. The students tool selection consists of 3 breadboards, combo wire cutter/stripper, junebug, speaker and wire.
The first project is to wire 2 74HC595's to drive LEDs from the Junebug. We are using the web article Serial to Parallel Shifting-Out with a 74HC595 written for the Arduino. Most everything but the code itself is applicable.
EDIT: I had the students make two changes to the circuit as used by the Arduino. The first was to tile MR to VCC with a 4.7K pullup and add a switch and pull it low. The second was to have the 74xx595 sink rather then source the LEDs.
The changes are trival but it allows the manual use of the MR to zero out ths shift register. This will cause all LEDs to go dark on the next latch chock/pulse.
The first project is to wire 2 74HC595's to drive LEDs from the Junebug. We are using the web article Serial to Parallel Shifting-Out with a 74HC595 written for the Arduino. Most everything but the code itself is applicable.
EDIT: I had the students make two changes to the circuit as used by the Arduino. The first was to tile MR to VCC with a 4.7K pullup and add a switch and pull it low. The second was to have the 74xx595 sink rather then source the LEDs.
The changes are trival but it allows the manual use of the MR to zero out ths shift register. This will cause all LEDs to go dark on the next latch chock/pulse.
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