This was the previous Hotplate project, which expanded the heating area by connecting the cloth iron's element to a copper plate. A mechanical mechanism called a thermostat was used to control the heating element of the original version of the hotplate....
To take temperature readings after removing the mechanical thermostat from the heating element, attach the probe of a K-type thermistor to the surface of the heating element. The closer the thermistor probe is placed to the heating element, the more...
As for the base, we use a 340x280mm plywood board. Using a sharpie, we mark the location of the heating element plate's hole on the plywood after positioning it on one side.We follow the same procedure for the circuit and then use a 6mm drill bit to...
We use four M5 bolts and nuts to mount the heating element. To hold the four bolts in place, we first set them in the correct spots and tightened them with an M5 nut on each of them.Next, we place a nut on each bolt.The heating element plate was then...
The wiring followed next, and it was really simple. We started by connecting the K-type thermistor terminals to the CON2 screw terminal port that was supplied on the circuit. The AC Heating Element Terminals are next connected to the CON2 screw terminal,...
For testing the hotplate, we have to prepare a SMD circuit for reflow. After applying solder paste to each component pad, we arranged each SMD component in its designated spot one by one.Next, we place the circuit on the newly finished SMT reflow hotplate...
As verified in the previous step, the hotplate is functioning as expected. The cutoff feature can be adjusted in the code because, after a few uses, it is evident that the temperature of the TOP surface and the temperature probe aluminum block differ;...
All project data is kept on the github server. The PCB is designed in Kicad 7. The kicad project directory is in pcb/x65-sbc-revB1 (please check if there is a newer version in the meantime). Direct link to schematic in PDF.
To update the TOTP authenticator you need the following: * A authenticator with the dfu bootloader installed (prebuild bootloader can be found here. * Dfu util * New software To install the new firmware follow the following steps: 1. Hold the "enter"...
The clock can be built in 4 or 5 meetings with kids. Recommend ages 10 - 18. Younger kids will need more help. One person can handle 8 - 10, with more you will need some help First meeting 1. I talk about what an...
Second meeting 1. Hand out the Arduino, RTC module, wires, alligator clips, USB power block and USB cable 2. I ask them how we are going to have the Arduino control the meters ? I explain what PWM signal is and how we can use...
I recommend splitting the group up into two sections. A lot of prep work is required for this meeting. You need to have milled all the faceplates (hours and min), I made a couple of extras. The plywood boxes also need to be lasered...
If you were able to get all the magnets glue in at the third meeting everything will be wrapped up at this meeting. If you were not able too, then we will need to have a short fifth meeting. I do the same steps as the Third meeting. Skip...
We are going to put shellac on the box. 1. Again give everyone wax paper and set of rubber gloves 2. I use Bulls Eye Shellac Clear. 3. I use a paper tower to spread it around. 4. Have them do each side. They...