Mt8870 decode in codevisionavr code#
Mt8870 decode in codevisionavr series#

Mt8870 decode in codevisionavr series#

The transistor is worth any NPN, in particular I have used the 2N3904, which is the simplest and cheapest to get.Д®ach output of the MT8870 (STQ, Q4, Q3, Q2 and Q1), goes to the resistance of 100 Ohms, and this in series goes to the base of the transistor (2N3904), while the collector joins it to the part of the button of the control that we want to activate and the emitter to the mass of the control. At the base of each transistor, we must connect a resistance of 100 Ohms, as protection. Since masses are common, we don't need to weld all those parts. That part will go to the transistor collector. What we are interested in is soldering the part of the button that is not mass. To be sure we will look with a multitester the mass. The buttons of the controls, usually join 2 circuits, leaving the mass in common. The MT8870 can be powered with the 5 volts of usb, which we can take out following the cables of the control with a mulitester. The concept is very simple, being the most difficult part in the manualities, to leave the control well prepared.

Mt8870 decode in codevisionavr code#

In the readings of the Asix (X1 and Y1) being analogical a value greater than 33768 is checked by code so that it is a logical 1, since it means that we have pressed the button or to the right (greater than 32768 that would be the center) or downwards. I recommend using all digital buttons, and the STQ always use digital. Right at the same time, as well as up or down (take it into account when soldering), as well as the 4 buttons, On ASIX (axes) it is not possible to press left and In this case, it is so because I have used the NES usb retro controller and onlyД¤ digital buttons are available, being the analogical cross. Q2 (Y1) I've used the crosshead to move down analog.Q3 (X1) I used the crosshead to move analog right.The command that has been used has been opted for: The program in Visual Basic, allows to select which buttons we want to use of the control as well as to which pin of the MT8870 Therefore, we enter in the section to build an application that translates the button presses in the binary codes that at the end are DTMF codes. It is recommended to put 500 ms in the ms Delay Between Digits at the time of sending. The program is not optimized, so send the tones slowly.Д¬an be tested with Windows' own joystick tester Read the buttons and translate it to DTMF tones. It has been created as proof of concept a simple program in VB6 (to work in old equipment W95) to be able to The buttons of a GAMEPAD, DTMF tones can be decoded. Thanks to the MT8870 chip, connecting the outputs of STQ, Q4, Q3, Q2 and Q1 to a transistor allowing to open or close