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Archive for July, 2019
Posted by eddy2019 | Jul 29, 2019 @ 07:22 AM | 1,779 Views
A microcontroller is a single-chip microcomputer that integrates the main part of a microcomputer on a single chip. Microcontrollers were born in the mid-1970s. After more than 20 years of development, their cost is getting lower and lower, and their performance is getting stronger and stronger, which makes their applications ubiquitous in all fields. Examples include motor control, bar code readers/scanners, consumer electronics, gaming equipment, telephones, HVAC, building security and access control, industrial control and automation, and white goods (washing machines, microwave ovens).

The role of the microcontroller
In industrial applications, the role of the microcontroller is to control and coordinate the actions of the entire device, usually requiring a program counter (PC), an instruction register (IR), an instruction decoder (ID), timing and control circuitry, and a pulse source. Interrupts, etc. are completed together.

According to the role played by the controller in the work, the main types of microcontrollers are as follows:

1, command controller

The instruction controller is a very important part of the controller. It needs to complete operations such as fetching instructions and analyzing instructions, and then handing it over to the execution unit (ALU or FPU) for execution, and also to form the address of the next instruction.

2, timing controller

The purpose of the timing controller is to provide control signals for each instruction in...Continue Reading
Posted by eddy2019 | Jul 25, 2019 @ 08:12 AM | 3,450 Views
Personal production circuit board method one:


1. Cut the copper plate into the dimensions required for the circuit diagram.



2. Place the wax paper on the steel plate, engrave the circuit diagram on the 1:1 wax paper with a pen, and cut the circuit diagram engraved on the wax paper according to the board size. The cut wax paper was placed on a printed copper plate. Take a small amount of paint and talcum powder and mix them into a thick, suitable print. Use a brush to pick up the print and apply it evenly over the wax paper. Repeat the board several times to print the circuit. This stereotype can be reused for small batch production.

3. An etching solution was prepared in which the ratio of potassium chlorate to 15 ml of 15% hydrochloric acid was 1%, and etching was performed on the plate to be etched.

4. Rinse the etched printed circuit board repeatedly with water. Wipe off the paint with banana water and wash several times to clean the printed circuit board without leaving a corrosive solution. Apply a layer of rosin solution for drying and drilling.



Personal production circuit board method two:


There are many ways to make printed circuit boards in amateur conditions, but this is not time consuming, or the "process" is complex or of poor quality. The method of making a printed circuit board is one of the better overall effects, as follows:

1. Plate layout. The pads in the figure are indicated by dots, and the wires can be...Continue Reading