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If you want to learn how to build your own electronics circuits, you’ve come to the right place. In this blog post, we’ll show you how to build a circuit for the at89c2051 and at89c51 microcontrollers. What You’ll Need: -Atmel Studio 6 -Circuit Prototyping Board (Eagle) -Copper Clad Project Board (Eagle) -5v Power Supply (Eagle) -Micro USB Cable (Eagle) -USB A Female Socket (DigiKey or any other supplier of similar product. Do not use USB A Female Socket from your computer) -Solder Iron and Solder -Multimeter (optional) Notes: If you’re new to circuit prototyping and don’t know where to start, check out the first part of this series: How to Build a Simple Microcontroller Circuit. If you want to learn how to use the free Arduino IDE, check out The Complete Guide To Programming Your First Arduino. If you want to learn how to create your own PCB layout, check out the Circuit Board Layout Creator Module. Lastly, for those interested in learning about microcontrollers and microcontroller programming, I suggest Microcontrollers – A Beginner’s Guide – Part 1. The at89c2051 is a microcontroller that runs at 25Mhz and can be programmed with the Atmel studio. Below is the schematic diagram. [[File:Example_Schematic_At89c2051_Allied_Signal.png]] Typical Application Circuit for the At89c2051 Microcontroller (Courtesy of AlliedSignal) The at89c51 is also a microcontroller running at 25Mhz and can be programmed with the Atmel studio. The Atmel website provides schematics for this microcontroller. Although the schematic diagrams are available on their website, I will provide mine here as well to save you time. [[File:example_Schematic_At89c51.png]] Typical Application Circuit for the At89c51 Microcontroller (Courtesy of Atmel) As noted on the schematic, connections to the I/O’s of the microcontroller are made to Port A through Port S of the microcontroller. This is the standard level-shifting technique for any microcontroller requiring serial communication. To read more about how to connect to external devices with a microcontroller, check out the first part of this series: How to Program a Microcontroller. In addition to schematics for your microcontroller application, you will need a schematic diagram for your circuit’s breadboard as well as a list of components. In this sections, I will provide you with both. First, let's take a look at the schematic diagram that will be used to create your circuit. [[File:Example_Schematic_Circuit_Breadboard. cfa1e77820
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