Some of the gpios not working

[bansari18]

Hello,
I am using aluminium touch pads as buttons through my gpios, is it possible that when i touch them electrostatic discharge occur and can it harm gpio..? when i was using 10 gpios, touching 1 even gets the other 2,3 gpios pressed. hows that possible? can gpio fluctuate like that? nd if it can be damaged in the way i mentioned, then how can i make cheap touch pads using gpios. I have used them in such a way..http://hackaday.com/2015/11/30/conjurin ... inum-foil/ but without using MPR121 as i was able to detect touches directly through gpio.. so can any one help out.
Thanks in advance
-Bansari

[pcmanbob]

You need to show us how you connected them, saying you followed the link but did not use the MPR121 is not really any help as clearly you have not followed what they did.

if you just connected the foil pads directly to the GPIO pins then my guess would be that you just have floating inputs, which will respond to any near by influence.

post some good quality pictures using imgur.com or post a diagram showing use how they are connected.

[bansari18]

You need to show us how you connected them, saying you followed the link but did not use the MPR121 is not really any help as clearly you have not followed what they did.

if you just connected the foil pads directly to the GPIO pins then my guess would be that you just have floating inputs, which will respond to any near by influence.

post some good quality pictures using imgur.com or post a diagram showing use how they are connected.

well, i have just detached aluminium foils but it is as simple as connecting a wire directly to gpio and touching it. .

[joan]

What have you done to prevent the GPIO floating?

[bansari18]

What have you done to prevent the GPIO floating?

i haven't done anything.. i just tried and it worked so i didn't do anything further.. now i want to know if they will never be useful to me? and yeah yesterday the rpi fan was doing much noise, so tried to hold that but dont know what happened it gone off and today i used diff power and it worked.. do that matters too in my case?

[KLL]

http://www.instructables.com/id/How-To- ... h-Arduino/
so it is a little bit more complicated as just to connect a aluminium foil to a GPIO pin
and try to read its input state ( without pull-up or pull-down resistors configured? )
so how you figure the GPIO is not working? you wear different shoes from yesterday?

pls start to give very detailed information about code and hardware and connection,
or better start internet research for your project again.

[bansari18]

i havent used pull up or pull down resistor but defined if there's no input then will have value 1 and whenever any touch detected then it will change to 0. and then again reset that values. do i need to attach aluminum foil to some resistor?

[pcmanbob]

connecting inputs to your gpio requires more than just a single wire you need pull up or pull down resistors to prevent your input floating..
I suggest you have a look at this site https://github.com/raspberrypilearning/ ... up_down.md

so you have a fan connected to some gpio pin and now it does not work but you say the fan is ok if tested else were, is your pi even booting now ? if you tried to stop the fan while it was running and connected to your gpio you may have overload the gpio due to the stall current drawn by the fan.

[pcmanbob]

i havent used pull up or pull down resistor but defined if there's no input then will have value 1 and whenever any touch detected then it will change to 0. and then again reset that values. do i need to attach aluminum foil to some resistor?

you cant use foil as a simple replacement for a switch on gpio , thats why in the link you posted they are using the MPR121 chip it does the detection using the foil touch pads and sends the information to the pi via I2c.

[bansari18]

connecting inputs to your gpio requires more than just a single wire you need pull up or pull down resistors to prevent your input floating..
I suggest you have a look at this site https://github.com/raspberrypilearning/ ... up_down.md

so you have a fan connected to some gpio pin and now it does not work but you say the fan is ok if tested else were, is your pi even booting now ? if you tried to stop the fan while it was running and connected to your gpio you may have overload the gpio due to the stall current drawn by the fan.

my pi was not working yesterday but it is working and fan,too. and yes while interfacing other components i have accidentally stopped fan sometimes, is it due to that or due to floating gpio? i will connect the pullup/down resistors as you mentioned but till that how can i get my gpios working?

[bansari18]

i havent used pull up or pull down resistor but defined if there's no input then will have value 1 and whenever any touch detected then it will change to 0. and then again reset that values. do i need to attach aluminum foil to some resistor?

you cant use foil as a simple replacement for a switch on gpio , thats why in the link you posted they are using the MPR121 chip it does the detection using the foil touch pads and sends the information to the pi via I2c.

so i should connect it to ic, not directly to gpio?

[bansari18]

connecting inputs to your gpio requires more than just a single wire you need pull up or pull down resistors to prevent your input floating..
I suggest you have a look at this site https://github.com/raspberrypilearning/ ... up_down.md

so you have a fan connected to some gpio pin and now it does not work but you say the fan is ok if tested else were, is your pi even booting now ? if you tried to stop the fan while it was running and connected to your gpio you may have overload the gpio due to the stall current drawn by the fan.

how can i use internal pullup/down resistor through nodejs

[pcmanbob]

connecting inputs to your gpio requires more than just a single wire you need pull up or pull down resistors to prevent your input floating..
I suggest you have a look at this site https://github.com/raspberrypilearning/ ... up_down.md

so you have a fan connected to some gpio pin and now it does not work but you say the fan is ok if tested else were, is your pi even booting now ? if you tried to stop the fan while it was running and connected to your gpio you may have overload the gpio due to the stall current drawn by the fan.

my pi was not working yesterday but it is working and fan,too. and yes while interfacing other components i have accidentally stopped fan sometimes, is it due to that or due to floating gpio? i will connect the pullup/down resistors as you mentioned but till that how can i get my gpios working?

as I said you probably overloaded the gpio by stopping the fan and lucky for you the thermal fuse protection on the pi power input tripped which is why your pi stopped working, leaving it over night allowed the fuse to reset so now your pi works.
there may be nothing wrong with your gpio inputs it may be that the conditions that allowed it to work yesterday are not present today. try building one of the switch input circuits and test it with that. https://github.com/raspberrypilearning/ ... up_down.md

[pcmanbob]

i havent used pull up or pull down resistor but defined if there's no input then will have value 1 and whenever any touch detected then it will change to 0. and then again reset that values. do i need to attach aluminum foil to some resistor?

you cant use foil as a simple replacement for a switch on gpio , thats why in the link you posted they are using the MPR121 chip it does the detection using the foil touch pads and sends the information to the pi via I2c.

so i should connect it to ic, not directly to gpio?

if you want to use a simple touch pad why not do it in the way shown on the web site you linked to, that after all is how they were doing it.

[bansari18]

hi..
its getting worse.. i am unable to connect touch ic through i2c as it shows all the addresses when i connect it, else shows no address. what should i do ? can the gpios be replaced? any ideas..
Thank you..

[DougieLawson]

You have fatally broken your RPi. The replacement will cost somewhere between £5 and £35 depending on the model.

[pcmanbob]

hi..
its getting worse.. i am unable to connect touch ic through i2c as it shows all the addresses when i connect it, else shows no address. what should i do ? can the gpios be replaced? any ideas..
Thank you..

first did you test your pi gpio with a switch as I suggested to see if they were still working ?

did you follow a set of instructions on how to connect the chip to I2c ?

[bansari18]

hi..
its getting worse.. i am unable to connect touch ic through i2c as it shows all the addresses when i connect it, else shows no address. what should i do ? can the gpios be replaced? any ideas..
Thank you..

first did you test your pi gpio with a switch as I suggested to see if they were still working ?

did you follow a set of instructions on how to connect the chip to I2c ?

yes i followed the instructions like https://learn.adafruit.com/adafruits-ra ... guring-i2c but i failed at last step. and yeah i can not get the input or output through those gpios which i mentioned not working. I tried from commandline with setting gpio -g (bcm pin) mode out , gpio -g (bcm pin) write 1.. but even that do not write on those gpios and work fine with other. but now my pi is down and its not starting.

[pcmanbob]

hi..
its getting worse.. i am unable to connect touch ic through i2c as it shows all the addresses when i connect it, else shows no address. what should i do ? can the gpios be replaced? any ideas..
Thank you..

first did you test your pi gpio with a switch as I suggested to see if they were still working ?

did you follow a set of instructions on how to connect the chip to I2c ?

yes i followed the instructions like https://learn.adafruit.com/adafruits-ra ... guring-i2c but i failed at last step. and yeah i can not get the input or output through those gpios which i mentioned not working. I tried from commandline with setting gpio -g (bcm pin) mode out , gpio -g (bcm pin) write 1.. but even that do not write on those gpios and work fine with other. but now my pi is down and its not starting.

well the first step is to try a fresh install of raspbian on another sd card and see if that helps.
also look at the red and green leds and tell us what they are doing also is the pi getting very hot ?

[bansari18]

now i am getting no indicating leds on as red is power and yellow for act.. but unfortunately now nothings happening. and yes i have used heatsink and fan but still i get nearly 80degree Celsius. Before it started tripping, it was nearly 70. so its getting hot.

[RaTTuS]

as Dougie said ,
you have killed your RPI =- get a new one and don't do what you did last time

[bansari18]

You have fatally broken your RPi. The replacement will cost somewhere between £5 and £35 depending on the model.

isnt there only gpio replacement or some fix

[pcmanbob]

You have fatally broken your RPi. The replacement will cost somewhere between £5 and £35 depending on the model.

isnt there only gpio replacement or some fix

Then I tend to agree with the others you have killed your pi.
no you cant fix the gpio the only option is to replace the Pi.