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18/09/2019 at 16:27

Ah, i dont understand why you’d get banned for things like that, im sure admins have their reasons, maybe something else?

OK, i had a bad toggle switch so that explains quite a bit.

I’m only having trouble with the proximity sensor side of things, maybe you can help? In the serial monitor it shows all switch positions beautifully.  Sensor value just keeps increasing on its own regardless of what the sensor is doing. Even if i simulate movement with a magnet and my proximity sensor, the system is indicating that its jammed and will run two unjamming cycles (reverse, forward, reverse, forward, halt). I’ve changed the input mode from input_pullup to just input and it has no effect.  I have continuity from sensor wire to arduino pin.

Please tell me I’m missing something and you know exactly what it is. 🙂

18/09/2019 at 07:55

Haha, i found your github code before I found this forum post.


I’ve tried your code but there’s a few differences between the systems, so i’ll have to dig a bit into the code or just ask here when i get stuck.


Im using a single phase motor connected to two contactors (one for reverse, one for forward, Schneider part number LC1D09M7).  The contactors are activated via a two channel omron SSR (photo is shared with this post), so one output pin from arduino for forward and another output pin for reverse.  Easy enough.


I got confused with hall sensors as there’s some that work as proximity sensors and others work as current detection.  Mine is the proximity type and costs less than 0.5euro.  its the same that @s2019 was asking about, you can google ky-003 to find it.  With no magnetic field present, sensor wire outputs high, with magnetic field sensor outputs low, it does not put out an analog value.

Now i’m just a little confused over some of the wiring with this code, like the 3 way switch.  I simply want “up” to be forward, middle to be off, and “down” to be reverse.


The values for turning the relays on and off were inverted for me which i just now discovered, now i feel like an idiot.  Anyways, i’ll make another post once i sort it out.


The code is great, i really like the configuration and it makes sense without much explaining. Kudos for that!

Here’s some photos of the hardware I’m using, also an Arduino nano because why not?  I do regret using it as it uses a usb mini cable which is going the way of the dinosaur.


In reply to: Sorting plastics …

16/07/2019 at 07:14

It’s in the download kit.

Look in the “2. Plastics” folder and you’ll have all the info.

15/07/2019 at 18:50

Thanks @mattia-io

Just keep doing what you’re doing.  It’s difficult to say what would help since I’m not sure.  An in country social media campaign would work well which is something I can do.

For now, i’ll keep growing what I have going on and it will take off on it’s own.  Currently there seems to be many waste banks popping up to deal with the crazy waste management situation we have here in Indonesia.  Some of them have been inquiring about Precious Plastic and what can be done, so things are moving along.

I’ll try and keep you guys updated.

And thanks for everything.  🙂

oh last thing, i’m working on building a cap color sorting machine.  I’ll share with the forum how to build it when i have it completed. 😀

15/02/2018 at 10:53

Here’s how I’d wire it. I’ll admit that i’m not an expert but i’d rather have the switch kill mostly everything inside the box. Here in Indonesia ground is typically connected to the neutral wire which makes touching things a bit exciting at times.

The wiring in this drawing is based on the diagram on your temperature control unit in the photo you shared.

15/02/2018 at 10:45

*deleted* (made a mistake in original post and cant seem to delete this)

10/05/2016 at 03:16

I suggest you lose the 3rd world country mentality. India is a mess like Indonesia, but both have the capacity and do produce the parts needed to build the shredder. There are most likely sources available in your country for all the parts. It’s a matter of finding sources. Hexagonal bars are made in India, for example.

Don’t forget to network! Seriously, networking is key, otherwise you are left struggling for finding where to find material, where to have them cut, where to have them welded, where to assemble, where to use. You need to figure these out before you start, otherwise you’ll find yourself frustrated and left with your question you have right now.

Google and social media are your friends. Use them to your advantage and you’ll find support.

09/05/2016 at 18:14

I’m working out the costs right now in Indonesia. I’ll be sure to get back to you as soon as I find sources for everything.

For example though, I found a source for 3mm steel plate, but it’s a 4’x8′ hot rolled steel. The quantity is quite large and the price equates to 32 euros. 6mm hot rolled steel is double the cost at 64 euros and the 5mm hot rolled steel is priced where it should be between the two. I know the blueprints are basically calling for stainless steel, but i have yet to locate a source for this.

Sourcing for hexagonal has me looking at a 4 meter length when i only need 320mm. Unsure of the price just yet.

So for now, it seems everything comes in bulk…except for the bearings and the motor. The motor i have not tried to look for just yet but will start looking this week by asking around.

I believe you really need to work to hit that price target. If you don’t, then you start paying more. It’s a matter of convenience vs frugality. Keep the faith.

08/05/2016 at 16:03

Plastic is an interesting medium. If you for some reason wanted to recycle styrofoam, you’re going to find yourself wondering if it’s worth it. A styrofoam (polystyrene) cup only takes 1 or 2 small pellets of plastic to make.

I think one of the interesting problems is that here we have the tools, but we need to be able to produce something useful as a product to make it worthwhile. People are quite crafty, i’ve seen hand bags made from toothpaste tubes, totes made from cement bags… we just have to figure out what people want and what’s valuable. There’s no point in producing more rubbish. Also, plastic can only be recycled a limited amount of times before it breaks down and becomes unusable.

Material Costs. I’m currently looking into the costs for building the shredder. I’ve found that the steel plates used in the construction is sold in sheets that are 4’x8′ each. This will no doubt provide material for more than just one machine…something i’ll try and calculate during this week sometime.

Plastic costs. This depends on your source. If you source from schools, then it might be free. If you source from companies…well…this might cost. Indonesia has these “plastic mafias” that are very protective of their sources of plastic from companies. The plastic gets recycled somewhere and somehow, but this would require some investigating in your community to figure out where it goes. I prefer the idea of keeping things local if possible, no need to ship plastic all over the world when you can deal with it locally.

This project is still a bit new, so i think having good figures right now may be a little difficult to come by. give it a few months and we’ll see what comes up!

02/05/2016 at 13:41

Hi guys! I just saw this post…

I’m having a meeting on Saturday. 🙂

I’m located in Tangerang. 😀

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