Eight soundspalo DIY, unexpected simple

Envy people of others Meng Meng, there is also artistic, but our lives. Such a life can no longer continue, come back to the second little brother, the homemade electronic piano is freshly released ~~ [Device Selection] 1, Microbit main control board * 1 2, MicroBIT extension * 1 3, touch switch * 7 4, branch module * 2 5, OR module * 4 6, speaker module * 1 (buzzer can also be replaced) 7, charging treasure 8, connection line [Functional implementation] Each touch switch represents a sound, you can implement different tones to control different tones. Set 7 touch switches to output 7 tones. [Hardware connection] Physical map: A little messy, a bit awkward, then, for our electronic piano, a cute box. There is a wooden instant, and then organize the sanction. [Code] The difficulty of small partners is concentrated in Microbit, in addition to the speaker module connection pin, only 5 pins, if you want to implement 5 pins to control 7 tones or more instantaneous feelings difficult to suspect life. . You can use branch and OR modules to control two pins, (see the following code) is ok ~~ 【knowledge base】 Binary decoder: The input of the binary decoder is a set of binary code, the output is a set of high and low level signals corresponding to the input code one or one. Binary decoder: can convert N input variables to 2 N-one output functions, and the minimum term that outputs the output function and the input variable has a multi-output combination logic circuit for correspondence. Three eight decoder 3-8 The input of the decoder is 3 feet, and the output is 8 feet. Use a high and low level to represent input and output. Enter is binary. 3 feet are 3-bit binary number. Enter 3-bit binary number. 3-bit binary is up to 111 is 8. The output is 8 feet, indicating 10 progress. It is output based on the input binary number. If the input is 101, then the 5th foot is high, indicating that the binary number is 5. In fact, the function of the 3-8 decoder is to translate the input 3-bit 2-based number into 10-based output. I finally did it, please play a song for us, there should be applause here ~~ Source: DFROBT Community

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