In this Instructable I am going to repurpose a coffeemaker into a travel alarm clock, when I worked as a truck driver I had this travel alarm clock I bought in a truck stop for $20.oo. It was advertised not to use near a graveyard or it would wake the dead. I went through three of these alarm clocks they had the knack of growing legs and walking off.
I found the coffeemaker while I was helping my friend George make his deliveries, at first I wanted to use the clock circuit for testing LCD displays. Later that week I was visiting my brother and he mentioned he didn’t have an alarm clock and I got a new purpose for the clock circuit.
All the parts I used in this Instructable were salvaged but the battery I bought at the local dollar store making the total cost of construction one day and one dollar.
Step 1: The Coffeemaker
Now that I knew the coffeemaker was working I dissembled the coffeemaker from the bottom up by removing all the screws from the base and then the components inside.
There are a few deep screws so you will need a long 12 inch Philips screwdriver.
I keep all the working parts that I may have a use for later.
Step 2: The Clock
There were 4 wires going between the two circuits and a thermal control line to turn off the burner when it was at temperature.
I removed the thermal control wire and tested the clock making sure the running LED light lit up and the relay tripped.
Step 3: Testing
The voltage to the clock was higher than the 5 volts marked on the circuit board this was probably due to the power circuit not having a regulator and the current went up when the relay was tripped.
Step 4: The Alarm
As with the heater relay the current doubled.
Step 5: Upping the Buzzer
There was no appreciable difference so I decided to go with the buzzer with the built in driver circuit.
Step 6: The Finished Wiring
I removed the wire for the function I didn’t need.
The relay wire was a ground switch so I connected the Piezo buzzer circuit to the power supply post and the relay wire.
Next I connected the battery terminal to the clock power supply post and the common post.
Once I had all the connections made I tested the all the functions of the clock making sure it went off at the time I set it to go off.
Step 7: The Finish Assembly
First I glue the lens cover on the LED
Then I screw the clear face on the clock with the labeled control buttons.
And using two sided tape I attach the buzzer and the battery to the back of the clock in a manner that uses the battery as part of the support to hold the clock upright.
Last I test all the functions making sure the clock goes off at the time I set it for.