One of the potential problems with the LED based flats panel I described in a previous article is that if the exposure time used for flats is too short the resulting images can show banding - sometimes quite severely. The images below give a couple of examples.
Xojo is a great tool for developing cross-platform applications from a single codebase. It allows code to be developed and then built for any or all of the following desktop platforms:
This project describes a simple device to measure temperature and relative humidity and displays their values, along with the apparent temperature, often describe as “feels like”.
The sensor used is the ubiquitous DHT21, a digital sensor which in this case is read via a small MCU chip, an ATtiny84, and the output displayed on a 16 character by 2 line LCD display.
The circuit schematic is shown below, and dxf files are available for download at the bottom of the page.
UPDATE: Under certain circumstances it is possible that this panel can produce flats with moderate to severe banding. An explanation of why this happens and how to fix it is given in this article.
