Hi!
My background is in mechanical engineering with an interest in computer programming. I wanted to learn microcontroller development and started with the Arduino. It is low cost with an easy to use programming API.
I started learning the Arduino environment with Ladyada's tutorials. I then moved onto my first real project: programmer for Maxim's iButton temperature and humidity dataloggers. The programmer can start and stop datalogging missions and display the current value without removing the devices from the field. I used the Sanguino (arduino clone) since I needed additional memory the ATmega168 did not have. The new ATmega328 should be able to handle it with no issues.
Ibuttons supported: DS18S20, DS1923, DS1920, & DS1921G. I am using DS1994 real time clock to sync time with the dataloggers. Datasheets can be downloaded here. The program also supports the DS18S20 1-wire temperature sensor which I attach via a custom made cable and RJ-11 connector. The ibuttons use the 1-wire interface.
The LCD is a two row Newhaven NHD-0216K3Z-FL_GBW purchased from Fun Gizmos running in I2C mode. Really neat since only 4 wires are required for power and data.
I chose to use a Maxim 6818 IC and hardware interrupts to handle button debounce as a learning opportunity and guarantee that a button press would not be missed while polling for attached devices.
I developed a simple user interface using 3 buttons to allow datalogging mission start / stop and duration to be changed.
Due to other commitments, I have put my microcontroller projects on hold for a while. However, I have received a request for the source code which I will publish and hopefully save others time if they want to use iButtons. (Close up picture)
Regards,
Jeff Miller
Hey would you be able to clone an ibutton? If so how much?
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