OpenEnergyMonitor BlogGlyn Hudson
Updated: 13 min 42 sec ago
Hi! My name is Eben I’ve been working with OpenEnergyMonitor for the past 10 weeks as part of a summer placement organised by Arloesi Gwynedd Wledig; a local project aimed at highlighting the local tech sector employment opportunities on Parc Menai the business park where we are located in North Wales, and the difficulties that they face, as well as the great perks of living in such a beautiful area. The scheme organised placements for four students in four seperate tech companies in Parc Menai. Here is a video with highlights the whole 10 week scheme: Working in a small company in a rural area, that has such a large online community has really opened my eyes to the possibilities that the internet and the digital age can offer, in that people are no longer bound to cities. Increasing infrastructure development in terms of roads and internet speeds has increased this mobility further, and I look forward to the growth that this will no doubt provide in Gwynedd. OpenEnergyMonitor is for me the perfect example of a growing business that has been made possible by opensource development, global connections and communities, and new technology.
Hi! My name is Eben I’ve been working with OpenEnergyMonitor as part of a summer placement organised by Arloesi Gwynedd Wledig; a local project aimed at highlighting the local tech sector employment opportunities on Parc Menai the business park where we are located in North Wales, and the difficulties that they face, as well as the great perks of living in such a beautiful area. ! ##Me, and Gwynedd I am currently studying physics at Cardiff University, and originally hail from Dyffryn Nantlle. As you can probably tell by my failure to find a decent photo of myself doing anything else, I’m (like Glyn and Trystan) a keen climber, and that’s been my primary reason for wanting to return to Gwynedd to work, with a long list of climbs in the Llanberis Pass, Ogwen Valley, and Tremadog, and more that I wanted to have a go at. It’s a great way to appreciate Gwynedd, in my opinion, and I even got to go climbing with Glyn. Check out the video here: https://www.youtube.com/watch?v=CzPMPY-I3_I A little cheesy, but we got to climb with drones filming, so that was pretty sweet. The other strong pull, for me, was the language; Cymraeg. I’ve spent two years now living and studying down in Cardiff, and the switch to the academic and leisure medium of English has been a little challenging, and it’s always amazing to come back to Gwynedd, and hear Welsh on the street and in the shop, and at home, and (at OpenEnergyMonitor) at the workplace as well. A lot of our culture is tied intimately to the language, and it’s been good to feel that again. ##What I’ve been up to During my time at the company, I’ve learnt how to write basic software from scratch (I’ve only ever done experimental analysis using python previously) to Arduino boards and the ESP8266, my eyes have been opened to the possibilities of GitHub, and other resources. I’ve played around with adding a DHT22 sensor to the ESP8266 and posted an example. I’ve also had the pleasure of working with Gwil on preparation and order fulfilment, which has been fun! Another interesting experience was the few times I visited the local electronics factory, Denis Ferranti where the boards are all manufactured. It was really cool to see the manufacture process, and the quality of the equipment there, and great to know that OpenEnergyMonitor are able to source their PCB’s locally, for zero economic sacrifice. Working in a small company in a rural area, that has such a large online community has really opened my eyes to the possibilities that the internet and the digital age can offer, in that people are no longer bound to cities. Increasing infrastructure development in terms of roads and internet speeds has increased this mobility further, and I look forward to the growth that this will no doubt provide in Gwynedd. OpenEnergyMonitor is for me the perfect example of a growing business that has been made possible by opensource development, global connections and communities, and new technology. ##The Scheme Through the project that organised this placement opportunity, the four of us (all at different companies) were asked to come to a conclusion on the situation regarding tech jobs in Gwynedd, and the so-called ‘brain drain’, as the best and brightest graduates leave the area to embrace city life. The overall conclusion was that perceptions need to change. People overwhelmingly do not view Gwynedd as a place with lots of potential for tech jobs, but research has shown that the truth is the very opposite, with Parc Menai alone set to be the location of around 200 new jobs in the next few years. At a presentation at Pontio, at Bangor university, the four of us students reccomended modernisation of the school syllabus, a closer relationship between companies and schools, more grassroots tech events (a brilliant example of this sort of thing are the events held by North Wales Tech (check them out!), and better utilisation of social media by companies looking for skilled graduates. I’d like to thank Glyn, Trystan, and Gwil for making this summer such an incredibly fun and rewarding one, as well as an extremely eye opening one. I’m sure the company has a huge future, and I for one will be following future products and developments with keen interest. Today is my last day, and it’s a little sad. I’m writing this blog but should probably stop and help Gwil with these EmonTH’s.. Eben, out. ps. here’s an introduction video to the scheme I was a part of: www.youtube.com/watch?v=RJxHQBpLgWk, and highlights video of the whole 10 week scheme: https://www.youtube.com/watch?v=N2v2a3ZJq0E There also will soon be footage of the Dennis Ferranti factory we visited, I will post it here as soon as it arrives! Thanks for reading!
Last night I attended EcoHomeLab meetup in Manchester organised by the CarbonCoop. EcoHomeLab monthly meetups at MadLab brings householders and green-technologists together to take control of home energy use and generation. It was great fun to catch up with regular faces as well as meet many new interesting people. I gave a short presentation overview of our efforts as OpenEnergyMonitor to make it as easy as possible for people to get started with energy monitoring and control (home automation) with a sustainability / energy saving focus. I presented the recent work we have been doing to integrate platforms such as MQTT, Node-RED and openHAB ready-installed and pre-configured on the emonPi, our RaspberryPi based energy monitoring platform. These additional platforms run alongside Emoncms on the emonPi. See the Integrations section of our user guide for more info Here are copy of my slides from the event: Download in PDF format (6.8 MB) View in HTML (hosted from Google Slides) View in full Google Slides format (with clickable hyperlinks & selectable text)
I have been been evaluating the HTU21D temperature and humidity sensor made by Measurement Specialties as a possible DHT22 replacement for the emonTH. This is quite a new sensor, released in 2013. The Si72021 is also a posiblity with an identical pin-out and specs. OctoPart list Datasheet Farnell item DFM footprint Digital, pre-clibrated I2C The metrics speak for themselves: Metric HTU21D Si72021 DHT22 DHT22 vs HTU21D Difference Cost in 1k off £1.42 (July16) £2.15 £4.57 (July16) 3.2 times cheaper (£3.15 less!) Vcc 2.1v - 3.6V 1.9V - 3.6V 3.3-6V Humidity accuracy ±2% RH ±2% RH ±2%RH n/a Humidity Range 0-100% RH 0-100% RH 0-100% RH n/a Temperature accuracy ±0.3°C ±0.4°C ±0.5°C 40% more accurate Temperature Range -40°C +125°C -40°C +125°C -40°C +80°C 56% more accurate Sleep Current 0.02uA 0.06uA 15uA 750 times less power Measurement Current 0.045mA 0.09 mA 0.5mA 11 times less power Measurement time 0.01s - 0.0026s 0.01s - 0.0026s 2s 200 times faster Energy consumed per sample 0.00045mW 1mW 2222 times less power Time sampling per day* 14.4s 2800s Time sleeping per day* 86386s 83600s Energy consumed per day* 2.36mW  2836mW  1201 times less energy per day!