Well almost. I realized a useful feature would be a button that, when pressed, would run each pump for 10 seconds. This would allow for cleaning with deionized or distilled water and also to check that all pumps are functioning. From the time a current is applied to the pump to the time water makes it out of the end of the ~3′ tube (1/4″ inner diameter) is about 1-2 seconds.
Check out these photos of the complete system after its first successful run in the bathroom sink.
The complete system.
Detail of the pump-head. You can see the the screws and nuts used that perfectly hold on to the pump’s housing. Click on the photo for a bigger view.
The bottom of the pump head. To help keep the pumps running, a drain sleeve will be cut and placed over the bottom and maybe top openings of the housing to prevent sediment from potentially clogging up the pump.
The pump-head housing is a 4″ PVC pipe cut in half. This allows for easier drilling of the pump retainer screw holes and getting the tubing into place.
Work on my thesis this summer will require that I be in more than one place at a time! Getting pricing on commercial/scientific portable autosamplers shows that there is plenty of room for more affordable options. That is why I will be developing a simple autosampler to collect and store water samples from river streams. The initial sampler will be arduino powered. 3-5 submersible pumps along with 3-5 collection bottles and a real-time clock should do the trick.
The logger Revision 3 of the Eco Sensor Network is headed out for its first field test. The R3 features on-board temperature and relative humidity sensor as well as logging to micro-SD. This particular unit will be recording fluctuations in tree stem size using a dendrometer and a 16 bit ADC bridge.
The oven controller assembly is complete. The device allows for the controlled heating of a toaster oven. Simply plug the toaster oven into the orange cord, turn the device on, set the rate at which you want the temperature to increase, place the thermocouple inside the oven and hit the start button. The logic is a bit off at the moment, but it works fairly well.
The final product. Oven controller.
Arduino UNO R3
2X16 LCD Screen
Thermocouple and Shield