Let me start with the wiring diagram for the final device. Here you can see how all components are connected.
The blue lines are busses which just group multiple related wires into one single line.
Create a Prototype
First you should use a breadboard and setup the whole device and test if everything is working as expected. This is a very important step, because there are so many things which can go wrong.
PREPARE THE STRIPBOARD
Place all components on the stripboard and mark their locations and especially orientations. Make sure there is enough space left for the wires.
Think about the wiring and how you plan to connect the components. Turn the stripboard around and mark all places where you plan to cut the copper stripes.
Use a drill oder any other suitable tool to cut the copper stripes at the marked places.
Clean up the resulting mess.
Inspect all cuts closely and make sure there is really no copper left. In doubt use a connection tester or ohmmeter to test the connections.
SOLDER THE COMPONENTS TO THE BOARD
Solder the components to the board. If you plan to reuse this components solder female headers to the board instead and plug the components to this headers instead. If you solder the components directly to the board it it almost impossible to remove them later.
Now add the power switch and the pin headers for the sensor, the display and the Qi receiver. Finally add all wires to the board until everything is connected. The picture above is showing the final assembled board with all components (except the display).
Check THE Wiring
Systematically check each wire from the wiring diagram. Search it on the board and check if it connects the right components and the correct pins. Turn the stripboard around and make sure there are no unwanted connections.
Build the Bottom Layer
I started with a piece of cardboard which I cut to fit exactly into the case at the bottom.
I checked if the battery fits on this piece of cardboard. Later I glue this battery to the cardboard using hot-melt adhesive.
If the cardboard fits into the case, I solder the two power wires to the Qi receiver module and attach it to the cardboard using two strips of insulation tape. Make sure the side with the coil points to the bottom of the case.
Turn the cardboard around and place it with the Qi receiver at the bottom of the case.
Attach the Humidity Sensor
Drill the smallest possible hole for the three wires of the sensor. Use hot-melt adhesive to attach the sensor to the case and push the sensor wires into the hole.
Use more hot-melt adhesive to seal the hole from both sides. Make sure the hole is completely sealed and no air comes trough this hole anymore.
Add the Next Layer
Place the battery on the cardboard and fasten it using either a double-sided tape or hot-melt adhesive.
Cut another piece of cardboard to fit into the case. Add insulation tape to the top side of this cardboard and put it into the case, covering the battery.
Now place the board with the components on top. Fasten the board on the cardboard using double-sided tape, hot-melt adhesive or cable ties. Plug in the battery, sensor and Qt receiver.
Build the Touch Pad
Print the keypad on a piece of paper. You can use my version which you can download here:
Cut equal pieces from a copper tape. I use 12mm copper tape and cut almost quadratic pieces from it. Solder short wires to the copper pads before you glue them to the paper with the keypad. To solder the wires to the copper pads, you should place them on a metal surface to allow the heat drain away.
Now glue the pads on the backside of the paper with the printed keypad. I printed black lines with the locations of the keypads on the front side to the back side.
It is important the paper with the keypad stays as flat as possible. If there is an air gap between the paper and the case top, the keys will not work.
Add a cardboard on top of the paper to provide space for the lead blobs on top of the copper pads. Use glue or hot-melt adhesive to fasten the cardboard on the paper.
Seal everything using a Perfboard without copper pads and push the wires as straight as possible though the Perfboard holes. Glue the Perfboard to the cardboard.
Connect five wires to a female header to create a plug. Or use crimps and a crimp header. In my case, the distance between the case top and the board was too small for a crimp connector why I used a female header as plug.
Solder the wires to the keypad. Add as much space as possible between the wires. The wires should not touch each other and lead as direct/short as possible from the keypad to the connector.
Fasten the keypad to the case top. I used hot-melt adhesive at the edge of the keypad to attach it to the top. It is important that there is no air gap between the keypad and the case top.
Fasten the Display
Solder a flat cable to the display and add a plug using crimps and a crimp housing. Fasten the display to the case top. I used small blobs of hot-melt adhesive to keep the display in place.
Close the Case Top
Plug in the display and keypad, switch the power on and close the case top. If you programmed the microcontroller with the software the device should boot and display the main menu. Congratulations!
Read more how to build the software.