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Serial Gateway on Raspberry Pi Zero GPIO

Serial Gateway on Raspberry Pi Zero GPIO

There are few ways to connect Serial Gateway to Raspberry pi. The easiest one is to connect Serial Gateway via USB port to raspberry pi. Due to the size of raspberry pi zero i prefer to have small PCB which will serve me purpose of gateway, zone and boiler controller. This can reduce the cost of having multi zone smart heating at the same time. Connecting Serial Gateway on Raspberry Pi Zero GPIO Raspberry pi GPIO are 3.3v tolerant but…

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Resizing the USB SSD on Raspberry Pi

Default way to resizing SD card with raspi-config is not going to work on USB SSD disk so we have to do this old fashion i.e. command line fdisk. Let change partition table with fdisk. You need to remove exiting partition entries and then create a new partition that takes the all the free space on the disk we have. This will only change the disk partition table not the data on the disk. First Part of this post about:…

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Boot Raspberry Pi from USB SSD

I was doing some read and write speed testing of PiHome SD card, it is doing good job so for me but i wanted to run raspberry pi from SSD drive connected via USB port and i wondered if it is possible or not so i across raspberry pi article  on how to do this. Lets simplify this for the sake to engineering steps. Run following command to check fuse

Above command should give you 17:1020000a which mean fuse…

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PiHome IFTTT Google Assistance and Node-RED

Link Google Assistant to PiHome

With a bit of spare time over the Christmas break, I have been working around with my google home and PiHome. I was ready to buy a boost console from PiHome but decided to try my own attempts first. Rather than using a physical button, I decided to try voice commands instead. Below is the description of how I got there – I’m sure you can think of a number of improvements/ a much simply way of coding this, but…

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LoRa Sensors, Zone Controller and ESP8266 Gateway

LoRa Sensors, Zone Controller and ESP8266 Gateway

LoRa stand for Long Rang, in this post i will show you what i m up to with LoRa Sensors, Zone Controller and ESP8266 Gateway. PiHome infrastructure i.e. battery powered temperature sensors, zone controller, boiler controller and esp8266 smart home gateway is built with nRF24L01 wireless which operate at 2.4Gh. nRF24L01 is cheap solution but it has range limitation and unable to penetrate through the solid walls and you need repeaters installed around the place to get full coverage. Its…

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6 Zone Heating System

I have 5 heating zone to control and domestic hot water in total i have 6 zone heating system, Four zone are on first floor with wired thermostat treated as single zone, ground floor zone with Nest wireless thermostat and domestic hot water with wired thermostat. I have 3 relays (1 for each zone) for upstairs and downstairs with electric zone valve, so when the thermostat close then zone valve power up and open zone and send 220 to zone…

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i2C Interface

Low power relays boards are one of the most common interfaces between a Arduino/Raspberry Pi and the outside world. These relay boards provides electrical isolation between the low voltage circuits of the Arduino/Raspberry Pi and the high voltage loads. So why this I2C relay board? i2c relay boards only requires 4 pins from Arduino/Raspberry pi to control up to 128 relay. Raspberry Pi i2c Example of controlling i2c relay board from Raspberry Pi 1 – +5V 2 – GND (common…

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Temperature Deadband

Idea is to have different cut in and cut out temperatures. In most cases it does not matter if temperature is sport on with accuracy of 0.1 degree specially for hot water. If you have deadband for active set-point you check if temperature is < set-point – deadband to start zone and you check that temperature is >= set-point+deadband to stop zone. This way you don’t cut in/cut out that often. This approach is used if you know that you…

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Zone Schedule with Conditional Coop start

PiHome Smart Heating Zone Schedule with Conditional Coop start: Idea is to have option in the schedule for the zone to have conditional coop cut in. Probably no big use for it if you have 3 zones, but might be handy for example for hot water, it makes more sense with multiple zones, with many zones there will be one of them cutting in after the other so probably boiler will run all the time. Zone with Coop Start Idea…

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Roadmap/Feature for PiHome

  i have tons of email from lots of people requesting different features and upgrades so i thought to have post on site about roadmap/feature requests for PiHome so we can share ideas what we can do and what is needed and how community can help and contribute, right now everything is under one post but once we get things moving we can have one dedicate page for each upgrade. List of request/features Under Floor Heating with Higher Inertia E-mail…

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