Remote for CD player
- Thread starter james1
- Start date
That is a very strange circuit. Is there a supply voltage anywhere? As it is it will present a varying resistive load between ground and the output depending on which button is pressed. Can you double check the circuit and put in the actual resistors?
The 14M is capable of doing this. It has a number of pins that can be configured as outputs or inputs and thus can simulate push button switches. The pins can be configured as an analog input to simulate the switch in an open circuit position, and can be configured as an output with a "low" to simulate the button being pushed and hence shorted to ground.
The details are in the appendix at the bottom of the first help file, but first can you double check the circuit.
Read through this thread http://www.picaxeforum.co.uk/showthread.php?t=8483&highlight=xbox&page=2 as this was a very similar project.
The 14M is capable of doing this. It has a number of pins that can be configured as outputs or inputs and thus can simulate push button switches. The pins can be configured as an analog input to simulate the switch in an open circuit position, and can be configured as an output with a "low" to simulate the button being pushed and hence shorted to ground.
The details are in the appendix at the bottom of the first help file, but first can you double check the circuit.
Read through this thread http://www.picaxeforum.co.uk/showthread.php?t=8483&highlight=xbox&page=2 as this was a very similar project.
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You will probably find there is a pull up resistor to V+ within the actual CD player, so the circuit shown acts as a normal potential divider arrangement, each switch changing the value of the voltage seen on the connection labelled 'output' (actually goes to an ADC input on the CD player).
Here is the proper circuit.
I was wanting to use the chip as you described and was just checking.
This is the first time I have seen this type of button configeration.
Will the 3.42V be enough for the chip and will transistors or just the pic pins be best for the buttons?
What circuit and code would be recomended for a IR remote?
Thanks
James
I was wanting to use the chip as you described and was just checking.
This is the first time I have seen this type of button configeration.
Will the 3.42V be enough for the chip and will transistors or just the pic pins be best for the buttons?
What circuit and code would be recomended for a IR remote?
Thanks
James
Attachments
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Ah, that makes sense, and with Technical's suggestion and your measurement of a voltage it appears there is a resistor somewhere else. It shouldn't matter though as a 14M can easily simulate a button by switching between low and open circuit.
I'm pretty sure all the IR remote stuff is covered in the manual, including the relevant commands. Do you have access to the picaxe manuals? Essentially it is just a led and resistor for the transmitter, and a resistor and sensor at the receiving end. Look at the commands infrain2 and infraout in the second manual. The picaxe does all the clever work.
I'm pretty sure all the IR remote stuff is covered in the manual, including the relevant commands. Do you have access to the picaxe manuals? Essentially it is just a led and resistor for the transmitter, and a resistor and sensor at the receiving end. Look at the commands infrain2 and infraout in the second manual. The picaxe does all the clever work.
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hippy
Ex-Staff (retired)
I've got a steering column CD control switch which works this way ( but no CD player for it ! ).
Looks like there are two choices for creating an IR remote for the CD player ( assuming that's what the question is ); use a PICAXE to read an IR remote and generate a pulse of right voltage for a period, or use the PICAXE to fake the button pushes of the circuit presented. The later would seem to be the easiest option.
A 14M and some diodes could perhaps pull each resistor down as required, otherwise it will be FET's or transistors across the switches.
Looks like there are two choices for creating an IR remote for the CD player ( assuming that's what the question is ); use a PICAXE to read an IR remote and generate a pulse of right voltage for a period, or use the PICAXE to fake the button pushes of the circuit presented. The later would seem to be the easiest option.
A 14M and some diodes could perhaps pull each resistor down as required, otherwise it will be FET's or transistors across the switches.
Thanks for your sugestions.
Here is my plan...
I will make an IR remote with a 08M on 3V. The button will be similar to the CD player as they will have resistors that is read by the ADC pin.
A 14M will receive the IR commands and make the corresponding pin low then high (like pushing the button).
Buttons:
Play
Stop
Previous
Next
Mode
Relay to 'mute' speakers
Do I and what type of resistors do I put on the serial pins?
What resistors should I use in the remote?
Attached are the circuit diagrams and below are the codes.
Code for remote:
Code for reciever:
Thanks for all your help,
James
Here is my plan...
I will make an IR remote with a 08M on 3V. The button will be similar to the CD player as they will have resistors that is read by the ADC pin.
A 14M will receive the IR commands and make the corresponding pin low then high (like pushing the button).
Buttons:
Play
Stop
Previous
Next
Mode
Relay to 'mute' speakers
Do I and what type of resistors do I put on the serial pins?
What resistors should I use in the remote?
Attached are the circuit diagrams and below are the codes.
Code for remote:
Code:
main:
let pins = %0000000
input 3 'ADC input
output 1 'LED
readadc 4,b1 'read ADC pin4 as b1
if b1 = ## then main
if b1 = ## then IR1 'mute
if b1 = ## then IR2 'play
if b1 = ## then IR3 'stop
if b1 = ## then IR4 'previous
if b1 = ## then IR5 'next
if b1 = ## then IR6 'mode
IR1:
high 1 'led on
for b2 = 1 to 3 'send infrared code 3 times
infraout 1,b1
pause 45
next b2
low 1 'led off
goto main
IR2:
high 1 'led on
for b2 = 1 to 3 'send infrared code 3 times
infraout 2,b1
pause 45
next b2
low 1 'led off
goto main
IR3:
high 1 'led on
for b2 = 1 to 3 'send infrared code 3 times
infraout 3,b1
pause 45
next b2
low 1 'led off
goto main
IR4:
high 1 'led on
for b2 = 1 to 3 'send infrared code 3 times
infraout 4,b1
pause 45
next b2
low 1 'led off
goto main
IR5:
high 1 'led on
for b2 = 1 to 3 'send infrared code 3 times
infraout 5,b1
pause 45
next b2
low 1 'led off
goto main
IR6:
high 1 'led on
for b2 = 1 to 3 'send infrared code 3 times
infraout 6,b1
pause 45
next b2
low 1 'led off
goto mainCode for reciever:
Code:
'set symbols
symbol mte = 0 'mute
symbol ply = 1 'play
symbol stp = 2 'stop
symbol prv = 3 'prev
symbol nxt = 4 'next
symbol mde = 5 'mode
main:
let pins = %00111111 'mute off, pins high
infrain2
if infra = 1 then mute1 'mute
if infra = 2 then play1 'play
if infra = 3 then stop1 'stop
if infra = 4 then prev1 'prev
if infra = 5 then next1 'next
if infra = 6 then mode1 'mode
goto main
mute1:
toggle mte
goto main
play1:
low ply
pause 100
high ply
goto main
stop1:
low stp
pause 100
high stp
goto main
prev1:
low prv
pause 100
high prv
goto main
next1:
low nxt
pause 100
high nxt
goto main
mode1:
low mde
pause 100
high mde
goto mainThanks for all your help,
James
Attachments
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I don't think the receiver will work as shown - the diode voltage drops are going to cause problems. Simulating a push button on a 14M is a bit more subtle - a button changes from a very high resistance to a short to ground. The picaxe can do this by simulating an unpushed button by making a pin an input (which sets it to a high resistance), or by making it an output and setting it low. The code is at http://drvernacula.topcities.com/controlling_devices_with_buttons.htm and it will only work for those 6 pins on a 14M as these are the only ones that can change from inputs to outputs.
Leave out the diodes. And on startup, the pins on the left of the 14M will default to high impedence but the three on the right will default to 'low' which for a button is 'on', so they will need to be set by the code as high impdence. Hopefully having three buttons pushed at once on startup won't upset the CD player.
Leave out the diodes. And on startup, the pins on the left of the 14M will default to high impedence but the three on the right will default to 'low' which for a button is 'on', so they will need to be set by the code as high impdence. Hopefully having three buttons pushed at once on startup won't upset the CD player.
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Thank you Dr_Acula for the info.
Attached is my new code and circuit.
I will order the bits in the next few days, so I there are any problems please let me know.
Current code for 14M reciever:
Thanks to all who helped.
James
Attached is my new code and circuit.
I will order the bits in the next few days, so I there are any problems please let me know.
Current code for 14M reciever:
Code:
start:
b0=0
let dirsc=%00000000' poctc0-5 all open circuit
symbol mte = 1
main:
infrain2
if infra = 1 then mute1 'mute
if infra = 2 then play1 'play
if infra = 3 then stop1 'stop
if infra = 4 then prev1 'prev
if infra = 5 then next1 'next
if infra = 6 then mode1 'mode
goto main
mute1:
toggle mte
goto main
play1:
b0=b0 or %00000001' leg10 as output (C0)
let dirsc=b0
low 3
pause 500
b0=b0 and %00111110' bit0 low
let dirsc=b0
goto main
stop1:
b0=b0 or %00000010' leg9 as output (C1)
let dirsc=b0
low 4
pause 500
b0=b0 and %00111101
let dirsc=b0
goto main
prev1:
b0=b0 or %00000100' leg8 as output (C2)
let dirsc=b0
low 5' connect low
pause 500
b0=b0 and %00111011' preserve all bits and C2 low
let dirsc=b0
goto main
next1:
b0=b0 or %00001000' leg7 as output (C3)
let dirsc=b0
low portc 3' connect low
pause 500
b0=b0 and %00110111' preserve all bits and C3 low
let dirsc=b0
goto main
mode1:
b0=b0 or %00010000' leg 6 as output (C4=bit 4)
let dirsc=b0
low portc 4
pause 500
b0=b0 and %00101111' bit 4 low
let dirsc=b0
goto mainJames
Attachments
hippy
Ex-Staff (retired)
Breadboard it first. Try different options to see what does and doesn't work. I'd go with the diodes personally if I could get them to work. Adjusting the R's may overcome the voltage drop.
There's the potential problem that on turn-on the lows of the 14M ( with or without diodes ) could act as an unwanted button push, also without diodes, the three lines going high will pull-up the common line to +V which could cause problems.
Using transistors/FET's in parallel with the switches should overcome that, being able to handle the reset to 0V and open-collector.
There's the potential problem that on turn-on the lows of the 14M ( with or without diodes ) could act as an unwanted button push, also without diodes, the three lines going high will pull-up the common line to +V which could cause problems.
Using transistors/FET's in parallel with the switches should overcome that, being able to handle the reset to 0V and open-collector.