Wiring your first physical breadboard is a frustrating experience. One wrong connection and the circuit does not work. Unfortunately without an experienced instructor by your side, it is difficult to find out where is the mistake. Our breadboard simulator acts as a virtual and patient instructor checking on your every connection.
Practice does not make perfect. Only perfect practice makes perfect - Vince Lombardi
Use the following steps to complete the wiring of the breadboard
- Select your schematic. The 1 to 2 demultiplexer is the easiest to start. When you select your schematic, the ones where you have completed the breadboard will be shown with a green background.
- Operate the switches in the circuit simulator. Read the description of the circuit for more information.
- Using the schematic, wire up the circuit in the breadboard simulator. When a wire end is placed in a socket of the breadboard that corresponds to a node on the schematic, the respective node of the schematic will turn red.
- If a correct connection is made, the wire ends will snap into the socket.
- When all the nodes are wired up, a red LED will light up near the VCC/GND terminals.
- You may now operate the breadboard switches and observe the LED results.
- Sign in with your Google account to save your breadboard connections and earn a digital badge.
- Note that all the VCC (red wire) and GND (black wire) connections are already done. When you wire up the actual circuit using the under US$10 Home Laboratory Kit, do remember to connect the VCC and GND wires.
- Click Help on menu to hide/show this Help panel. This site is optimised for computer browsers.
Note that the holes connected by the blue lines are electrically connected in the breadboard.
If you are unfamiliar with the breadboard, there are many resources available online that explains how they work. We recommend this quick Breadboard Infographic from Make Breadboarding Workshop or the longer Breadboard Tutorial from Science Buddies.
The half adder adds two one-bit binary numbers A and B. The output is the (S)um of the two bits and the (C)arry.
- 0+0 -> C = 0, S = 0
- 0+1 -> C = 0, S = 1
- 1+0 -> C = 0, S = 1
- 1+1 -> C = 1, S = 0
For more info, see binary addition
- Learn how to design a Half Adder to obtain the above schematic.
- Practise to breadboard the circuit correctly on the simulator
- Wire up the actual circuit using the under US$10 Home Laboratory Kit and observe the results
D7 is (S)um and D6 is (C)arry.