In September 2010, I started this website where I share my ideas and designs with the world.
To promote solar energy, I develop a solar-powered bicycle. On sunny summer days, the solar bike should drive entirely on solar energy. When there is no sunlight or the batteries are empty, it may not cost substantially more energy to drive the solar bike than a normal bicycle. So, unlike most ebikes, which are heavy, the solar bike must be lightweight and sportive.
Soon became clear that the solar bike is a major challenge, only with expensive high tech materials, such a bike can be built. Therefore I use the best components that are available worldwide.
Because I always come across items that I want to improve, I roll from one project to another. Things that I have developed in that way are the lightweight ebike battery charger, solar cell curve tracer and the lightweight bicycle rear rack.
It is the intention that the solar bike is ready in 2014. The base is a lightweight 12.5kg e-bike.
China brushless motor controller schematic
Here is the schematic of the KU63 motor controller which may also give insight into other Chinese motor controllers. Download the circuit high definition pdf file HERE. If someone finds a bug, please report!
Spot welder features
A fine-spot welder is one of the few equipment where building yourself is cheaper than buying. There are already published a lot of DIY spot welders, this one has some unique features:
- It can be used in 2 welding applications: opposed and series configuration.
- The construction is kept very simple.
- Accurate electrode force adjustment.
- It has a solid electrode holder, made of a radiator earthing clamp.
- An Arduino microcontroller is used to set the weld time accurately.
- Creates a double pulse which improves clamping.
- The current can be reduced for welding sensitive parts.
Spot welder series configuration
Switches and push buttons need debouncing. It is straightforward to do this with software, using a library. The advantages of the Switch library are:
- Minimal used program space: 506 bytes.
- External pull-up resistors are not required.
- Supports also long press and double clicks.
Connecting switches to the Arduino
There is nothing needed beyond the switches, just connect the switches between the ground and a digital pin:
Why calibrate a multimeter?
To ensure accurate measurement results, a multimeter must be calibrated periodically. For companies, calibration of instruments is usual and even mandatory. For hobbyists, it is expensive. The calibration of a multimeter can even be more expensive than buying a new one.
I have developed a cheap multimeter calibration reference by which you can calibrate a digital multimeter yourself. See here the calibration of the low cost multimeter PeakTech 2010.