Using Circuitscribe to Build a Test Circuit for Beambot Logic

The circuitscribe pen is used to draw a test circuit for a NAND logic gate used for a Beam Bot Project.

Materials:
Standard Nand Gate

Breadboard

Leads

10 kOhm Resistors

Washing Pegs and Magnets

Circuitscribe Pen

Circuitscribe Metal Sheet

Circuitscribe Magnetic Bi-LEDs

Paper

Step 1: Circuitry

In the circuit diagram given the switches are to be replaced with photo transistors which receive light.
The circuit will output the following:

Both sensors read no light i.e. sensor crossing a black line : Both motors on

Both sensors read light i.e. sensors on white : Both motors on.

Only one sensor receives light : Motor connected to specific sensor circuit runs.

5V power supply was made by connecting leads to an old USB cable and run from standard computer USB Port.

Standard 74LS00 NAND gate was used.
It is recommended to plan the circuit in pencil before drawing with the circuit scribe.

The NAND gate is placed on the breadboard with leads running from the breadboard to the ink spots on the paper.
The connection between the lead and Ink spot is held with a washing peg, in central areas it is held with magnets.

No photo transistors or emitters are included in the test circuit. Photo transistors are to be connected in the positions indicated by the red ovals.

The test circuit's outputs are the two LEDs, to be replaced with motors.

Step 2: Connect the Power Supply & Test

Power Supply is connected from computer to two pegs shown.

You can now test the logic as mentioned in the previous step by opening and closing the connections where the red ovals are present. (Switch included with kit works well).

Recap :

Both sensors read no light i.e. sensor crossing a black line : Both motors on

Both sensors read light i.e. sensors on white : Both motors on.
Only one sensor receives light : Motor connected to specific sensor circuit runs.