Create your own PC moisture sensor via PS2/Gamepad Controller
16.3 years ago electronics, water
Yet another component for “Project Everbearing” where I need the ability to monitor the moisture level of my soil. There are a couple options on how to do this; the classic method is to take two galvanized nails at a fixed distance apart in the soil. If you run electricity through one of the nails, some of the electricity will pass through the other nail depending on the amount of moisture, in much the same way as a variable resistor works. If the soil is completely dry it will have no conductivity (infinite resistance) since low voltage electricity does not pass through dry soil, as water is added the resistance is decreased and with completely drenched soil almost having complete conductivity.
Unfortunately, I did not have any galvanized nails and with our current snow storm I wasn’t going to venture out to the local Home Depot. I did fortunately have something even better, a handheld soil moisture sensor, which I bought when I started gardening before I learned I can see if I need to water by putting my finger in the soil.
With a little manhandling I got the cover off the back and realized that this tool works with the same principle as the galvanized nails with just two wires with provide variable resistance depending on the water content.
[And I thought my soldering was bad]
Now all that is needed was to solder these wires to a couple open points on my PS2 Controller which I am already using as a cheap temperature sensor The great thing about this implementation is the “resistor” has a broad range from no conductivity to nearly zero. Which is great since it gives a very accurate representation of the soil’s water saturation. For the calibration I was a little lazier this time and only took two points “Dry” and “Really Wet” With these measurements I then calculated the water saturation percentage. So now I can see my plants are at a 43% water saturation level, which I have no idea what exactly that means, but I do know I don’t need to water for a few more days.
One warning though since electrical conductivity can be affected by application of fertilizer (especially synthetic fertilizer which may contain sodium) and temperature so accuracy may be around 70-85% but for higher accuracy there are other expensive ($500) alternatives out there but I can live with this for my application.
Tags: cheap, outdoor plants, vegetables
Plants reveal your gardening shortcomings through Twitter
16.3 years ago electronics, water
Botanicalls DIY Plant Twitter Kit is an electronic device you insert into your houseplants and by giving them access to the Internet via Ethernet jack, they kindly praise you when water them and scold you when you are slacking via Twitter for all the world to see. At $99 per unit and require assembly (soldering) might be more cost effective to just let your plants die or at least get watering back into your winter routine. Though I imagine with a PS2 Controller, handful of galvanized nails, some wire, and a little coding someone could put together a cheaper solution. Guess who grew up watching every episode of MacGyver, this sounds like possibly one more project to add to my long list…
Tags: cheap, outdoor plants, vegetables
Broto Domestic Greenhouse grows plants through aeroponics
16.3 years ago aeroponics, hydroponics, indoor growbox
If you want something that is a little more aesthetically pleasing than the $20 PC Grow box and don’t have the counter space for an AeroGarden then the Broto Domestic Greenhouse might be the right option for you. Information such as price and if it will actually be commercially available seem to be missing, but seems to be a completely self contained aeroponics solution and given the use of LEDs for lighting I would imagine it would be a fairly low power consumer.
Tags: cheap, growbox, led, outdoor plants, vegetables
Propagating peppermint and lemon verbena – UPDATE
16.4 years ago lemon verbena, peppermint
As you can see from the picture, my peppermint and lemon verbena propagation has come a long quite well. I did have a little aphid infestation on the peppermint plant which I attempted to take care of with manual pinching, but eventually I gave up and chopped off the top off the plant. I then followed up with a hefty dose of insecticidal soap to the soil and the remaining stem. I would have preferred an even more natural method such as ladybugs but sure my officemates would prefer I didn’t.
The lemon verbena did pretty well on its own with one exception I think I mistakenly broke or cut the top off the plant so there was no vertical growth and just crazy shoots horizontally so I cut most of these off and replanted to 3 new starts which have taken off as well as their parent.
Tags: cheap, outdoor plants, pepper plants, peppermint plant, vegetables
Fall Strawberries
16.4 years ago strawberries
I really like the color of these strawberries I propagated last this summer. I still have to figure out what I am actually going to do with these.
Tags: cheap, outdoor plants, strawberry plants, vegetables
Getting the garden ready for winter
16.5 years ago garden maintenance
The leaves are changing and falling the days are getting colder and I am personally coming to the end of my vegetable growing season. I do have a few post season activities before I completely call it a year.
Remove plants: Now my plants have lived a good life but now need to be removed. I mulch my lawn so I am always lacking greens for my compost bin so this is a good time to get some new materials. Most of my remaining plants are tomato, pumpkin, and cucumber plants which have some tough skins so I will chop them up with my lawnmower prior to add them to my modest bin. While you have your mower running this is a good time to let it keep running until it runs out of gas to avoid gumming up the engine when you fire it up next spring. This is also a good time to inspect and sharpen or replace the blade since if you are like me you will completely forget about this when you finally get around to mowing next spring.
Fertilize: If you only can fertilize one time throughout the year now is the time because turf grasses have the ability to store food during the winter months to allow a very quick rebound after the winter months. My primary concern is for my lawn which I am applying alfalfa pellets, since we have had some intense rains these past weeks they should break down quickly and not have the appearance of goose poo for too long. While applying I also allowed some to fall into by beds to help microbial activity and give my empty beds a head start for next spring. Be sure to avoid beds with and vegetation since you want to avoid any new growth with first hard freeze coming up.
Turning the soil: This can be a controversial activity since messing with the soil can inhibit microbial activity though turning the soil now can give you a head start next spring. My motivation is more on the lines if killing baby slugs (I know I am cruel) The slug activity in my garden was pretty minimal but I have concerns the few visitors may have decided to raise a family in my bed for next year. If I simply turn the first few inches of the soil I can expose the tiny slug eggs which birds will eat as a snack and any remaining will be destroyed during our first good frost. As an added benefit this will be a good time to catch up on my slacking in weeding during the last few weeks.
Taking care of your tools: Now is a good time to find those missing tools that may be hiding in your yard and garden. I have no idea why manufacturers choose to make these things green; almost like they want us to lose them to buy more ïŠ If you find any of your tools it is a good idea to put a light coating of oil on metal parts of your tools. You can also apply some Linseed oil to the wood portion of your tools.
Frosting on the top: At this point my garden is looking pretty good….even tempted to start planting though I will resist the urge. I have a plan to hold me over this winter but that will require its own post. After I have had a couple good frosts to kill off any slug eggs I will break open a couple of my bags of leaves and spread on a solid layer on top of my beds. Not only will this provide some food and temperature protection for the worms in my garden but whatever remains will be a great addition of organic matter for my garden.
Now with all this work I should be ready to start gardening way earlier than I should next spring…will I ever learn.
Tags: birds, cheap, compost, garden seeds, organic vegetables, outdoor plants, tomato plants, vegetables, worms
