Thank you for having a gander at my 19th Kickstarter Campaign! Let me introduce you to the "Tommy-Knocker"! This neat little project board is Arduino compatible, can program a secret knock pattern of up to nine knocks, and can be easily interfaced with projects that use other TTL compatible platforms. Best of all, this board can control an external 12v electromagnet! It is extremely easy to use! You can pledge towards a complete DIY set, or a fully assembled and tested unit. Some reward tiers even include a 12VDC electromagnet, and other accessories. Do you want to control 120VAC devices? Well you also have the option to do that. The on-board relay can be used to act as an isolated high power switch, or it can be configured easily to control a 12v electromagnet. It is just a matter of changing some jumpers! I'll speak on this more below.
About four years ago, I tried my hand at designing a secret knock kit, but I had a lot of trouble with the reliability of the sensor that I was using at the time. About three months ago, I tried again on a breadboard using a piezo sensor, and I was off to the races. I wanted to make a board that would be interesting to project makers, students, electronic hobbyists, and escape room owners. I believe that I've come up with just that!
How does it work?
Upon powering up, the on board red LED (NO) turns on for a moment, and then turns off, which tells you that the board is ready for a new program. The included piezo sensor (Which is glued or epoxied to the knocking surface) waits for a special knock. Your secret knock can include up to nine knocks, or anywhere in between. Once you've created your secret knock, the blue LED (YES) flashes, which tells you that your knock has been programmed successfully! Each time the sensor detects a knock, the green LED (HT) flashes, so that you can visibly see each knock as you go.
When the secret knock is received, the unit automatically toggles one output pin, and sets another output pin for a few seconds, before clearing that bit again. This is the momentary pin. These two pins can be used to communicate with an external programmable platform, such as Arduino. There are also three FAIL output pins that you can interface with your external circuit. One of these three output pins is the momentary failure output, which is set for a short duration, before being cleared again. The other two outputs are toggling outputs that are inverted from one another. On power up, one of these failure outputs is set at 5v, and the other is cleared to 0v. When a failure occurs, the normally set line clears, and the normally cleared line is set to 5v. All of this will be talked about in detail in the upcoming video manual!
Depending on the state of the jumpers, you can choose not to use the relay at all, in order to save power. You can also choose to toggle the state of the relay every time the secret knock is recognised, or you can choose to turn the relay on for five or so seconds, then turn off. Lastly, you can choose to configure the relay as a 12v electromagnetic lock controller, or you can choose to use the relay as a high power isolated switch, which can be used to control 120VAC devices! It is just a matter of configuring on-board jumpers. You can customise your project with ease.
The Electromagnetic Lock Set is easily the most exciting accessory offered with this campaign. Some reward tiers include this electromagnetic lock set, while others do not. This set comes with an electromagnetic lock, a mountable lock bracket, and mounting hardware. Below is a video that talks about how to mount these locks. This electromagnetic lock is rated for 12VDC at 100mA, and is very strong when the magnet and the cracked are lined up properly!
The Electromagnetic Lock Set Demo Video:
The AC-DC Wall Adaptor & Wire Connectors are the secondary accessories associated with this campaign. If your reward tier mentions that an AC-DC wall adaptor and wire connectors will be included, you'll receive 8x female to male wire connectors for the sake interfacing the Arduino compatible outputs to your external electronic circuit or platform. The AC-DC wall adaptor acts to power both the main board, and the electromagnetic lock set. This 120-240VAC 50/60Hz to 12VDC 1A wall adaptor is compatible with both western and eastern mains, but the plugs may not be compatible with some overseas wall outlets without and adaptor. In order to power just the main board, all you need is a 9VDC to 12VDC source, capable of 200mA or more. If you are powering the electromagnetic lock, you'll need a 12VDC adaptor that is rated for 500mA or more.
The Video Manual & Assembly/Test Video:
I'm a huge fan of using videos to demonstrate the functions of my inventions. As well, I'm also very enthusiastic about making detailed assembly and test videos for pledges who wish to put my inventions together themselves piece by piece. I've done this for all of my campaigns. The assembly/test video, as well as the comprehensive video manual will be available to all pledges, and will be available by the end of this campaign. I will be releasing project updates with the the links to these videos. I will also be creating a project page at http://www.engineeringshock.com/ at the end of this campaign, which will hold all of the video links, and any other information that I release.
The Project Schedule:
Two weeks after this campaign launches, I will have enough information to forecast how many assemblies, components, accessories, and PCBs will be required to fill all rewards at the end of this campaign. It will be at this time that I will be readying my orders, and starting a dialogue with my manufacturer.
Three weeks after this campaign launches, I should have all of my orders placed, and I should have an ETA from my manufacturer as to when all assembled units will be ready for shipment.
During the fourth week, I should have the project page up on my website, and I should have completed both the assembly/test video, as well as the comprehensive video manual. By this point, pledges should expect to have the youtube links to these videos via project updates. I should also be expecting the arrival of component orders and printed circuits boards during this time. The assemblies should be arriving by the 5th week, which is the first week after this campaign ends.
Week five and week six will be dedicated to putting together DIY kits, quality testing assembled units, and readying reward shipments. Reward shipments should all be out the door six weeks after this campaign is launched.
Kickstarter and the Kickstarter community have been very good to me. Most of my projects wouldn't leave the bread board stage without the support of those of you who find my projects to be interesting. In return for the generosity and support of this community, I've always done my best to ensure that rewards be shipped out on time, or even early in many cases. If I've earned your pledge, then you can count on me to work as hard as humanly possible to get your reward shipped out to you quickly! Thank you for taking an interest in my campaign!
Risks and challenges
As with all of my previous campaigns, I see very little risk here. I've been able to ship rewards on time for all of my previous campaigns. I sometimes even ship early! I have several component sources for each of the components required to fulfil reward shipments, and I have an excellent relationship with my manufacturing associates. They've never let me down. If you have entrusted me with your pledge, then please know that I don't take that lightly. It is my priority to ship out a quality reward to you as soon as humanly possible. Thank you for taking an interest in my 19th campaign!Learn about accountability on Kickstarter
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