Hello, I wanted to something useful and fun after having finished the A-Levels. So I thought about building something electronical and i thought about a meteorological station. I have so far built an Analog to Digital Converter, so the temperature sensors shouldn't be the problem, but my electronical knowledge is delimited. My question is if the rest like connecting a rain sensor is very difficult? Then i would look for something simplier as a start. Greetings Mark
...in general no problem. humidity is i.e. an capacity sensor light is LDR wind is an generator or magnet with hal-sensor temperature can also be measured by I2C capable sensors, so you can use a kind of network display - already some experiences? KR, Klaus.
That sounds like a good idea for a first project, if you already have a little experience with microcontroller programming or programming in general. The good thing about a weather station project is that you can start with the basics (a simple temperature display) and then gradually expand into all the different areas of microcontroller programming (more sensors, data logging to memory card, radio transmission, graphical display, network interface...). To measure temperature and humidity accurately I would use the SHT75, it is a fully calibrated sensor with a digital output. But a simple thermistor might be better for a start, using it will help you get some experience with analog circuits.
If it is for fun it shouldn't be a problem. Interfacing all kinds of sensors to an MCU is a common task in embedded development, you'll find many examples. At some point you'll find that getting more precision and accuracy becomes difficult. Something like getting twice as precise requires to work four times as hard. That's the moment I would stop in a fun project with that particular sensor and turn to the next sensor :-)
>display - already some experiences? Yes, my Analog/Digital Converter sent the data straight to a display. But it was only a small one, I think I will need a bigger one :-) Well then, I'm gonna try it out and see if it works. And it doesnt need to be a high precision measuring tool, because it's only for personal use. Thanks for your answers! Greetings Mark
Andreas Schwarz wrote: > To measure temperature and humidity accurately I would use the SHT75, it > is a fully calibrated sensor with a digital output. But a simple > thermistor might be better for a start, using it will help you get some > experience with analog circuits. A lower priced alternative to the SHT75 are Honeywells HIH series of humidity sensors with voltage output e.g. HIH-4010/4020/4021 and HIH-5030/5031 (with lower operating voltage) or GEs ChipCap (temperature + humidity, voltage or digital output). ChipCaps are available from Digi-Key, HIH from digikey and Newark/Farnell