help with my project please

Im new to arduino and this is my first post here so Hi :slight_smile:

Im helping my kids build a game that we've come up with cant say too much about it yet :-X

but its fairly straight forward but being new to this i wonder if i could get a little advice on building this,

i need to be able to set an adjustable count down timer with a rotary knob/pot on the Arduino uno i have within a selectable range of anywhere from a few seconds to up to about 5 mins activated with a rocker switch with the ability to be able to turn it off again, but while its on and counting down it can turn on mains power 240v up to about 13amp, when the timer runs out the power goes off.

ive already bought an arduino kit but still need a relay but not sure which i need the kit ive got consists of the bellow hopefully everything i needs there apart from the relay :slight_smile:
thanks

1 x UNO R3
1 x Development expansion board
1 x Mini Breadboard
1 x 830 point solderless Breadboard
1 x Stepping motor driver board
1 x 1602 LCD module
1 x 8*8 Dot Matrix display
15 x LEDs
1 x Seven-segment display (1-digit)
1 x Seven-segment display (4-digit)
1 x Stepping motor
1 x SG90 9G Servo
1 x Active Buzzer
1 x Passive Buzzer
1 x 8-bit shift register(74HC59)
1 x Potentiometer(Adjustable Resistor)
1 x Lm35 Temperature Sensor
5 x 1 kohm Resistor
5 x 10 kohm Resistor
8 x 220ohm Resistor
3 x Light dependent Resistor(Light sensor)
4 x Push buttons
1 x Flame sensor
1 x IR Receiver
2 x Tilt sensor/Switches
1 x USB Cable
30 x Jump wires
1 x 40pin header(2.54mm)
1 x IR remote control
1 x 9V Battery case
1 x SMD component box
1 x Storage box

What do you need?
Is this an electric chair project? :-X

What sketch are you working from?

just my recommendation--
just buy an SSR (like above) and dont use uno.. use mega2560 with the 3.2 " TFT LCD and make all the hardware in software..
easy project that way..

LarryD:
What do you need?
Is this an electric chair project? :-X

What sketch are you working from?

LarryD:
What do you need?
Is this an electric chair project? :-X

What sketch are you working from?

Ha maybe for the next project! No no sketch at the moment, sketchless

Given that you're a self-confessed noob, the phrases "mains" and "240v", "13A" and "Arduino" and "kids" fills me with horror.

Please be careful when you are working with lethal voltages (and this is most definitely not trying to be patronising but I've learned the very hard way to have the utmost respect for mains voltages - and I won't put them near my Arduino except via a opto-isolated relay module or similar when I've fully tested it with much lower voltages first).

And you must have a sketch (a program, some code) for anything to run on the Arduino, so where is it (or have you some pseudo-code (a worked out piece of logic) that you need to turn into Arduino C++? It would be helpful to even post that here.

And if you are interested in a relay module to make things easier (and safer) there's a video #17 (I think) on my YouTube Channel that describes this and some traps too (regarding safety).

backwoodsjack:
http://www.ebay.com/itm/24V-380V-40A-250V-SSR-40-DA-Solid-State-Relay-Module-3-32V-DC-To-AC-/201414937205?hash=item2ee5440a75:g:0MoAAOSwD0lUduWt

just my recommendation--
just buy an SSR (like above) and dont use uno.. use mega2560 with the 3.2 " TFT LCD and make all the hardware in software..
easy project that way..

what makes that an easier project from using the bits i already have backwoodsjack?

Ralph_S_Bacon:
Given that you're a self-confessed noob, the phrases "mains" and "240v", "13A" and "Arduino" and "kids" fills me with horror.

Please be careful when you are working with lethal voltages (and this is most definitely not trying to be patronising but I've learned the very hard way to have the utmost respect for mains voltages - and I won't put them near my Arduino except via a opto-isolated relay module or similar when I've fully tested it with much lower voltages first).

And you must have a sketch (a program, some code) for anything to run on the Arduino, so where is it (or have you some pseudo-code (a worked out piece of logic) that you need to turn into Arduino C++? It would be helpful to even post that here.

And if you are interested in a relay module to make things easier (and safer) there's a video #17 (I think) on my YouTube Channel that describes this and some traps too (regarding safety).

I understand your concerns Ralph ive worked with mains power in my line of work construction and ive been a tinkerer for a while, as for the sketch im hoping to put together sketches that have already been written as what im doing dosent look like anything new,

thanks i will have a look at your youtube page

backwoodsjack:
http://www.ebay.com/itm/24V-380V-40A-250V-SSR-40-DA-Solid-State-Relay-Module-3-32V-DC-To-AC-/201414937205?hash=item2ee5440a75:g:0MoAAOSwD0lUduWt

just my recommendation--
just buy an SSR (like above) and dont use uno.. use mega2560 with the 3.2 " TFT LCD and make all the hardware in software..
easy project that way..

I would never recommend a newby do any wiring for mains voltage. it is lethal.
it always makes me wonder if someone tried and the widow did not know where to post to tell us the project was... shall we say. less than successful ?
howver
http://www.powerswitchtail.com/Pages/default.aspx
keeps the low voltage stuff away from the high voltage stuff.

forty-two:
Im new to arduino and this is my first post here so Hi :slight_smile:

welcome.
please take a minute and read the first (second?) sticky post one every forum titled how to use this forum.
is it iem #6 that discusses subject lines ?
looks like you need help with count down timer.
sounds like you have a neat project. I am sure you will do well.

The one that gets me is the flame sensor. :slight_smile:

“mains”, “kids” and “flame sensor” — why do I have a bad feeling about this??? :o Perhaps something battery operated would be a better direction?