Through the I2C interface to communicate with singlechip, you can read year, month, day, week, hour, minute, second, you can read up to 2100. The PSTN module is based on the high-precision, real-time DS1307 clock module. Inputs compatible with TTL and 5-V CMOS logic.50 V output (there is a version that supports 100 V output).500 mA rated collector current (single output).Torque with traction: >34.3mN.m (120Hz).Nominal voltage: 5V (or 12 V, value indicated on the rear).The parameters of this stepper motor are: The servo is held in by the two halves of the feeder and does not need to be glued, but you can glue it down too if you want.A 28byj-48 stepper motor with its controller When you're satisfied with the feeder, hot glue the hopper and bottom parts together, be sure to only glue the flat areas, if you glue too close to the wheel it could get stuck. If it is, put some of your food in the hopper and run the feeding cycle to make sure the amount of food you want is coming out and that no plastic is coming out with it. Test fit everything again, this time, run the feeder code to make sure that the wheel is spinning freely. If you mess up, remove the glue and try again. The pocket in the wheel should face upwards towards the hopper when the glue solidifies. Make sure the servo is in the default position the code brings it to (just wire it to the arduino and let it run a feed cycle), and hot-glue the feeder wheel to the axle of the servo, a medium-sized drop should be enough, you want the wheel firmly attached but don't want excess glue to clog the servo itself. The servo should fit within the hopper and bottom along with the wheel. Once the 3D printed parts are ready, test the fits. 3%.Īll the parts should take about 1-3 hours to print depending on your machine's settings, plenty of time to complete the next step! That can be done by boiling the parts, which I recommend you do for just the wheel if it doesn't quite fit since annealing will shrink the parts by about. ![]() I used Raptor PLA from makergeeks, which comes in a ton of colors and is super strong after you anneal it for 10 minutes. You can print the hopper upside down without support material, and I printed the bottom upside down as well so the support material was in the servo's cutout for cosmetic reasons, and it leaves the mating surface smooth and level.įor materials, I recommend using a food-safe plastic. When printing, be sure to use support material for the wheel pocket and bottom. I recommend calculating about how much food you want dispensed at a time by volume and changing the pocket's dimensions to match. If you modify the feeder wheel, remember to keep the pocket as wide as the opening in the hopper, too small and food could get stuck and too big and it may slip past the wheel and overfeed your fish. Simply adjust the Fusion 360 file to fit your tank. By default it's designed to fit on my tank's 13mm rim. Make sure the bottom will fit on your tank. I have not printed or tested the SG90 parts. ![]() The SM22 STLs definitely fit together, since they are the ones I have used. Both contain the Fusion 360 files if you want/need to modify any of the parts. zip folder contains two sets of STL files, one for the original SM22 servo motor that I used and another for the far more common SG90 servo. You're not going to get far without them.The. So, if you use flakes like me I highly recommend you grind them up to the point where they will all fit into the wheel in any orientation, and pay special attention to this if you're planning on leaving the tank unattended for a long period of time (like, more than a week), a clogged hopper will prevent your fish from being fed! In theory, any solid food should work, and I have found that unground flakes will clog the hopper. If the amount of food coming out is not enough, simply copy/paste the feeding code in the arduino to dump a second or third portion into the tank.Īs for the type of food, I've only tested it with ground-up fish flakes. The feeding mechanism is the same for all three tiers, so if the amount of food it meters out is too much for your tank, I've provided the CAD files from Fusion 360 for you to edit, simply reduce the size of the pocket in the feeder wheel to reduce the amount of food coming out. I have a betta and 5 neon tetras in a 13 gallon tank, one feeding cycle puts enough food into the tank for all of them. Use this if you're on a tight budget or, like me, you can't get Tier 2 working before you leave for a week and a half for the holidays.
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