Hi all, was wondering if anyone had those plans for the spectrophotometer that some of yous made a few weeks ago? also, according to the meet up app, there was supposedly some tutorial going around for how to transform a mini fridge into an incubator?
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Hi All,
I am happy to join in and help with the fridge incubator as this probably has a few similarities to my lab cold storage monitor project.
For those interested;
I use an Arduino framework-hardware called nodeMCU,
this micro-controller has wifi and will easily connect to the
internet. On this device I have installed an open-source IOT/home
automation firmware called Tasmota.
Sensor and control data can be either managed locally (via a web
interface on the lab wifi) and/or with a cloud-based processor
such as
Node-red.
All parts of the project are open-source, minimal coding.
A really easy start for the Incubator might be to consider using the Sonoff TH16 with a light bulb as a heat source. The Sonoff can be flashed with Tasmota as well.
I have a Sonoff TH 16 which I could bring to the meetup, and we can see if it could be useful.
Please let me know if this is interesting to you
Best wishes
Patrick Scott
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Hi Jenny
This idea would require minimal "hacking" of the incubator;
Looking at your Reptile egg incubator, I see that there are temperature set-point selection buttons (up/down).
Assuming the total set-point range is 5C - 60C in 1C increments, there are a total of 55 temperature values that can be set by button-presses.
A method to set a value electronically could be;
1. Zeroing: press/actuate the down button 56 times (in say 3
seconds) - this will result in the minimum set point (from any
previous arbitrary set-point).
2. Setting: press/actuate the up button the number of times corresponding to the desired temperature above 5C, so for example if we want 37C , then we actuate UP 32 times.
3. Timing: Now we start a timer for 7 hours, and do nothing else.
4. Timing: At timer remaining = 0 hours, we first goto 1 (Zeroing), then press/actuate UP for 10 time to change the set point to 15C.
5. Timing: Now we start a timer for n hours, and do nothing else.
6.Timing: At timer remaining = 0 hours, we don't change the
set-point, we send a notification to Jenny's smartphone, and
switch on a "cycle-complete" light. and do nothing forever.
Tasmota firmware offers the ability to switch a relay, and switch
it quickly (pulse) like a button-press for example.
We could have two relays, one wired across the contacts of the UP button, the other across the DOWN button.
We can write Tasmota rules to actuate the relays, the correct number of pulses and use a timer to create your temperature time profile.
The advantage of using Tasmota rules, is that all the processing is local, no IOT needed. The disadvantage is there is no user interface to speak of.
Off-course you don't have to run the process on the Tasmota
device, you could undertake all the control either locally in a
PC/SBC or in the cloud using something like Node-red.
Tasmota can also read a IO input (called a switch), this could be used to start/stop/reset you profile.
Patrick
HI Richard,
Thanks for your email. Yes Im happy to help, its an interesting project. It looks like you are planning to re-design most of the control electronics, quite a task!
Here's a quick idea:
You know that you can buy temperature controller at a low price;
https://www.ebay.co.uk/itm/154706490808 14 pounds
These have both heating and cooling modes, a user interface etc..
You could get two of these and relays to control your heater and cooler devices, and use two programmable time switches to select temperature controllers.
You program the set-point temperature you want for the first period, and then you program the timer to switch on the 1st temperature controller for that period, then switch off.
For the next period you program the set-point temperature you want into the 2nd controller, and set the timer to turn on the 2nd temperature controller at the same time the first one turns off.
You will have:
1) fully programmable two temperature control system.
2) user interface.
3) Low cost in time and effort, I recon you could build it for GBP 70 in parts and one afternoon wiring it up.
4) No coding.
Programmable time switches: 11 pounds
Patrick
I will come meet you and share ideas on 19th.
See you then
Patrick
Hey, I just can across this which might be a fun way to run the incubator:
I have a Sonoff TH to donate to the project, I will see if I can get it flashed before we meet up
Patrick