Today.... This MQ2 gas sensor with Neopixel RGB lamp on top and a capacitive touch button under the circle mark on the front.
It is part of the d-diot project. The files of the 3d-printable case are available in Thingiverse.
The firmware is available here, the wiki page is under construction.
In the next weeks I will try to print it in wood... Just to increase the WAF 
Hi guys,
today I have finished the 3d printable case of the d-diot hub.
The hub basically is a Raspberry Pi 3 with the d-diot board (see this topic) that offers the following functionalities:
IR Gateway (blaster and receiver) to control every device that has a dummy infrared remote.
433 Mhz Gateway with the RFLink firmware running on the on-board ATMega2560 microcontroller
Dual MySensors Gateway: NRF24 (2.4 Ghz) and RFM69 (868 Mhz).
Latch circuit to power-on and safely power-off your Pi with a simple button press.
SSD1306 I2C Oled display controllable in Home Assistant
Radio activity LEDs for IR and Mysensors gateways
Nice and powerful web interface thanks to Home Assistant
Easy setup and configuration with the d-diot image
If someone is interested, here the detailed build instructions.
@nca78 
thanks for the info! I have seen that the Anycubic resin is available also in big online stores like Amazon, so fast delivery time guaranteed.
@NeverDie: Unfortunately the fragmentation is the dark side of the moon of the open source world, but in my opinion the quality of some project here is really awesome and above the average, so it is a shame that they don't have the adequate visibility. In addition in this last months some big pcb manufacturers like JLPCB have included in their offer an assembly service, so, with the adequate visibility and documentation, the entry barrier for new users in the DIY home autmation could be not so high.
@berkseo The "marble" case is very cool! The filament is easy to print or requires some special parameters? For example in this days I'm fighting with a wood filament, below the results
Hi guys,
this is my last node. A 3d printable smart USB power hub.
If someone is interested, here all the details.
Dear makers,
after a lot of learning and some tentatives, I have finished my d-diot project.
Basically it is a board that sits on top of a Raspberry Pi and has the following features:
Latch circuit to turn on and off safely your Raspberry Pi with the SW1 button.
Infrared receiver and transmitter with activity LEDs.
USB port to add extra infrared transmitters (or simply charge your phone).
DC power jack and power status LEDs.
433 Mhz Gateway (RFLink) with the Atmega2560 microcontroller and 433 Mhz radio modules (FS1000A and RXB6)
MySensors dual Gateway with NRF24L01 and RFM69 (868 Mhz) radio modules and radio traffic LEDs.
I2C OLED Display (SSD1306) controlled through Raspberry GPIO.
FTDI and ICSP connectors to program the ATMega2560 microcontroller.
Step-up and step-down voltage regulators.
Fan pin header.
Footprint for optional high gain 433 Mhz and 868 Mhz antennas.
A pre-configured Raspbian image image with Home Assistant and MySensors is also part of the project.
In the d-diot wiki you can find a detailed description of how I have configured the Raspberry to support two radio modules.
Maybe this can be usefull for some other people.
If someone is intersted on the project, well simply contact me.
Any comment or suggestion is well appreciated.
Hi, finished two nodes based on the same multi-purpose battery powered pcb (all the documentation here)
One is a door / window sensor based on a Reed switch.
If someone is interested, the dedicated wiki page contains the detailed build instructions.
The other is a soil moisture sensor.
For this one, the wiki page is here.
Happy Easter, even if at home!
Found a solution! It is quite easy with the custom board features of PlatformIO.
I wrote a brief tutorial here.
Tested with a Pro Mini 8 MHz 3.3V and FTDI programmer.
Unfortunately I don't have here a 16 MHz 5V devices to test
@zboblamont A cheap and silent alternative could be one of this qotom mini pc.
I'm using one of this as a virtual machine server with proxmox since 2-3 years and I'm very happy with it.
One of the vm is running pfsense so it act also as a main router / firewall for the entire Lan.
The backup of a vm is super easy but the initial setup of the environment requires a bit of Linux learning
@tbowmo Thank you for your effort! Now my turn... the whole schematics of the d-diot board is available for download here!
Of course I have to learn more and do some testing before implementing in the d-diot board the constant current source circuit that you suggested, but this a great option to eliminate the MP1584 (that one day may become unavailable on the market) and to lowering the cost. For the same reasons my plan is to substitute the step up module MT3608 with a boost converter circuit, made from standard passive components (like this).
In any case, if someone else needs to make an universal IR remote with a Raspberry Pi, the configuration of the GPIO pins of the Raspberry is here, while the steps necessary to configure LIRC and lirc_web are here.
The final results is this:
Here the guides to play with the IR gateway (add a remote, clone a remote, Home Assistant integration)
Hi, to power a sensor or actuator with a 18650 li-ion battery I have designed this pcb based on a tp4056 module and MT3608 booster.
Schematic:
Main features:
Load sharing circuit to safely power the load while charging the battery
Boost converter MT3608 (optional) to increase the output voltage. To reduce the size of the board the right part delimited by the vertical white line can be cut out
Charging status signaling led (optional)
Voltage dividers (optional) to measure Vin - V batt - V boost - V standby. Output available through J4
Battery reverse polarity protection through mosfet Q4, excludable through jumper JP3
Battery voltage measure point can be selected through jumper JP2
This board can be used with this one
I have ordered it (JLCPCB) but yet tested. After that if someone is interested I can share it through openhardware.
Any suggestion / improvement / comment is well appreciated.
Hi guys,
this is my last node. A 3d printable smart USB power hub.
If someone is interested, here all the details.
Interesting topic!
I agree, the amount of time required to learn how to do the things is quite high and after a lot of research you will find that other people have had the same issue... so in the end you have just reinvented the wheel!
In any case I think that MySensors is a very good project and probably underrated respect to how good and useful it is for a maker that wants to build its own domotic sensor and actuators.
For the reasons above (and others), some times ago I have started the d-diot project:
The hub (Raspberry Pi + d-diot board) implements, among the other things, two MySensors gateway (RFM69 868 Mhz + NRF24L01). All the software configuration steps are well documented in the dedicated section of the wiki.
In general the software part is easy because all is preconfigured in the d-diot image. Just burn the iso image to an SD card and you will have Home Assistant and MySensors working and ready to go.
3d printable sensors and actuators and the relative PCBs and firmware are part of the project. All parts (hardware, firmware, 3d printable case) are open source
In the wiki you will find the detailed build instructions (with pictures) for each device, so @mhkid and @Psilin maybe here you can find some useful information or a at least a good starting point for your nodes. In particular the Mini-BT-Pcb-328P is a general purpose and flexible board that could be useful for a lot of small (battery or USB powered) RFM69 or NRF24L01 nodes.
Now I'm in contact with PCBway, a PCB manufacturer that offers also soldering service, so If there are enough people interested, I think that it is possible to start thinking about the possibility to start a small production of some boards, maybe already assembled. In my opinion this will be helpful for other people.
Let me know... maybe we can start something
@NeverDie a sodium hypochlorite solution is what is commonly known as bleach. Probably is more convenient to buy it rather than produce them.
Just to give you an idea, below a picture of a famous bleach commercialized in Italy... Maybe you have the same brand in your country
Your question about the concentration and efficacy is interesting.
Hi guys,
today I have finished the 3d printable case of the d-diot hub.
The hub basically is a Raspberry Pi 3 with the d-diot board (see this topic) that offers the following functionalities:
IR Gateway (blaster and receiver) to control every device that has a dummy infrared remote.
433 Mhz Gateway with the RFLink firmware running on the on-board ATMega2560 microcontroller
Dual MySensors Gateway: NRF24 (2.4 Ghz) and RFM69 (868 Mhz).
Latch circuit to power-on and safely power-off your Pi with a simple button press.
SSD1306 I2C Oled display controllable in Home Assistant
Radio activity LEDs for IR and Mysensors gateways
Nice and powerful web interface thanks to Home Assistant
Easy setup and configuration with the d-diot image
If someone is interested, here the detailed build instructions.
@BearWithBeard 
I love the video of the swiss guy!
@NeverDie Good question. My is too young (2 days) to say something.
Here a possible solution. See at about 9:50
Hi, finished two nodes based on the same multi-purpose battery powered pcb (all the documentation here)
One is a door / window sensor based on a Reed switch.
If someone is interested, the dedicated wiki page contains the detailed build instructions.
The other is a soil moisture sensor.
For this one, the wiki page is here.
Happy Easter, even if at home!
@skywatch Thnaks!
The main goal of this board is to offer a simple way to build any kind (RFM69 and NRF24 support, MYSX connector) of compact battery powered node.
Today I have finished the first node based on this board: a door window sensor (reed switch).
If someone is interested, here the detailed build instructions.
The next node based on this board will be a soil moisture sensor!
Hi guys,
in order to facilitate the development of any kind of battery powered sensors (or actuators), I have designed this small pcb that can be easily placed in a 3d printable case
The main features are:
Small dimensions: 55 x 35 mm
Multiple power options: 2 x AAA batteries or 1xAAA battery (Rechargeable or Alkaline), 1 x CR2032 battery, standard cellphone charger at 5V through the micro USB port or through Vin and GND pin of the MYSX connector
Reverse polarity protection (Mosfet Q1) to prevent damages in case of wrong batteries insertion.
Boost converter (ME2188C33) to increase the battery voltage to 3.3V when necessary
LEDs for radio traffic and low batteries signaling. All configurable in the firmware.
Multiple radio module supported: NRF24L01 (SMD and THT) and RFM69.
Footprint for a reed switch
MYSX connector v.2.6
Support for ATSHA204 chip (security and signing)
Mounting hole for a M2.5 screw
Probably in this days the ATMega-328P is a sort of "old" technology but for simple battery powered devices it remains a good option, also for its easy of use.
If someone is interested, all the informations and the links to technical files (kicad project, gerber, schematics, firmware, etc) are in the dedicated wiki page of the d-diot project.
Hi guys, thanks for this release! Tested with a Pi 4 and a dual ethernet gateway (RFM69 + NRF24): it works!
My /boot/config.txt is here.