Archive for category Personal
Solar Powered Temperature & Humidity BLE Beacon Fun With Linux
Posted by darkskiez in Electronics, Personal, Software on May 7, 2018
Overview
Solar Powered temperature and humidity sensing beacon with super capacitor storage for nighttime operation.
Another low effort blog post with mainly notes to myself that others might find useful.
TODO: pics
TODO: screenshot of app
TODO: Crude Linux dumping commands
sudo hcitool lescan --duplicates --passive >/dev/null & sudo hcidump --raw|grep -A2 "50 A0 00" > 04 3E 2A 02 01 03 00 28 20 03 50 A0 00 1E 02 01 04 1A FF 4C 00 02 15 00 05 00 01 00 00 10 00 80 00 00 80 5F 9B 01 31 00 01 6F 68 C3 B9 -- > 04 3E 2A 02 01 03 00 1A 1B 17 50 A0 00 1E 02 01 04 1A FF 4C 00 02 15 00 05 00 01 00 00 10 00 80 00 00 80 5F 9B 01 31 00 02 6C 66 C3 C5
# Temperature Sensor TEMP [℃] = 175.72 x (TEMP x 256) / 65536 – 46.85 Example: TEMP = 0x67 [hex] = 103[dec] TEMP [℃] = 175.72 x (103 x 256) / 65536 – 46.85 = 23.85[℃] # Humidity Sensor RH[%] = 125 x (HUMIDITY x 256) / 65536 – 6 Example: HUMIDITY = 0x74 [hex] = 116[dec] RH[%] = 125 x ( 116 x 256) / 65536 – 6 = 50.64[%]
Sometimes errors when starting lescan
sudo hciconfig hci0 reset
USB Debug Stick
The supplied debug stick for programming the beacons is partially usable with linux with no special drivers. The stick has a mode switch for BLE scanning mode and interfacing with the beacons serial interface / charging it.
$ sudo dmesg [132354.828122] usb 1-1: New USB device found, idVendor=04b4, idProduct=f139 [132354.828133] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=128 [132354.828140] usb 1-1: Product: Cypress KitProg [132354.828147] usb 1-1: Manufacturer: Cypress Semiconductor [132354.828153] usb 1-1: SerialNumber: BLE1304041XXXXXXXXX [132354.837228] hid-generic 0003:04B4:F139.000C: hiddev0,hidraw0: USB HID v1.11 Device [Cypress Semiconductor Cypress KitProg] on usb-0000:00:14.0-1/input0 [132354.838599] cdc_acm 1-1:1.2: ttyACM0: USB ACM device
# With debian or probably ubuntu sudo apt install ckermit cat <cyalkit.kermit set line /dev/ttyACM0 set speed 115200 set handshake none set flow-control none set carrier-watch off set local-echo on set terminal newline-mode on connect quit EOF kermit -y cyalkit.kermit # Press ctrl-\ and then q to quit
TODO: device config
help Get uuid, input:uuid+Enter Set uuid, input:uuid xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx+Enter Get major, input:major+Enter Set major, input:major xxxx+Enter Get minor, input:minor+Enter Set minor, input:minor xxxx+Enter Get txpwr, input:txpwr+Enter Set txpwr, input:txpwr *+Enter Get rssi, input:rssi+Enter Set rssi, input:rssi *+Enter Get itrvl, input:itrvl+Enter Set itrvl, input:itrvl *+Enter Get coid, input:coid+Enter Set coid, input:coid xxxx+Enter Get nid, input: ednid+Enter Set nid, input: ednid x...x(20 char)+Enter Get bid, input: edbid+Enter Set bid, input: edbid x...x(12 char)+Enter Get edtxpwr, input:edtxpwr+Enter Set edtxpwr, input:edtxpwr * * * *+Enter Get edframe, input:edframe+Enter Set edframe, input:edframe + one or some of uid/url/tlm+Enter Get edstate, input: edstate+Enter Set edlock, input: edlock xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx+Enter Set edunlock, input: edunlock xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx+Enter Get eduri, input:eduri+Enter Set eduri, input:eduri (url or hex string)+Enter Get edadpwr, input:edadpwr+Enter Set edadpwr, input:edadpwr * * * *+Enter Get edtxmode, input:edtxmode+Enter Set edtxmode, input:edtxmode LOWEST/LOW/MEDIUM/HIGH+Enter Geblue 0Command format error!!er Set editrvl, input:editrvl *+Enter edreset, input: edreset+Enter Get sensor, input:sensor+Enter Set sensor, input:sensor on/off+Enter Get mode,input: mode+Enter Set mode,input: mode BLEBeacon/Eddystone/EDTest+Enter Initialize, input: init+Enter Get ver, input: ver+Enter Exit, input: exit+Enter
Unplug USB Stick.
Attach sensor to the stick.
Push switch towards Usb port
TODO: advert dumping with usb stick
Push switch away from usb port
cat the tty
TODO: linux parsing
TODO: iBeacon format
Different advertisment flags might break simpler softer – link to beacontools
Major is beacon id
Minor is temp/humidity – Equations
Shame its not eddystone with sensor values, thought programmable firmwares from cypress community forums might help
Wireshark Bluetooth Dumping
$ sudo hcitool lescan --duplicates --passive >/dev/null & $ xhost +local: $ sudo wireshark $ xhost -
TODO: Wireshare dump example
00:A0:50:XX:XX:XX mac
TODO: Crude Range analysis
Can I change tx power in a useful way?
Does itrvl setting in DM allow a different timer / battery usage ?
I added support to beacontools for this format (https://github.com/citruz/beacontools/pull/8)
sudo apt install libbluetooth-dev sudo pip install beacontools[scan]
Can Anyone Explain My Gas Bill Power Discrepancy
I’ve been trying to figure out how much my gas / heating / showers were costing me, but I’ve hit a fairly big discrepancy that I can’t explain.
I have a brand new 28kW/h rated boiler, with 98% efficiency rating, and according to the service manual it will consume 28.57kW/h max worth of gas, or 3.02 m^3 per hour.
I have found through measurement of having a 7 minute hot shower that the boiler was running full whack, consuming exactly at the rate claimed by the guide, 3.02 m^3, but this equates according to my bill to be 34 kW/h.
Where is the extra energy going / being wasted?
| Boiler Stats | Value | Units |
| Gas Max Flow Rate | 3.02 | m^3/hr |
| Max Heat In: | 28.57 | kW/h |
| Max Heat Out: | 28 | kW/h |
| (Calculated Efficiency) | 98.0049002450122 | % |
| Meter Readings | ||
| Used | 12.5 | ft^3 |
| Duration | 7 | min |
| Metric Conversion | 0.35375 | m^3 |
| Flow Rate | 3.03214285714286 | m^3/hr |
| Gas Qualities / Constants | ||
| Calorific Value | 39.7 | |
| Conversion Factor | 1.02264 | |
| kW/h / MJ | 3.6 | |
kW/h at Max Flow = Max m^3/h (3.02) * Calorific Value (39.7) * Conversion Factor (1.02264) / kWh per MJ (3.6)
kW/h at Max Flow = 34.0578889333333
Chili Beer
With Chillies in! Yum.
Where: Byres Road Peckhams
Cost: £1.89
Strength: 4.2% Vol
Verdict: Better than expected, light lager with subtle and warming chili taste. Small Bonus for screw top, slightly overpriced. 7/10
The first two bottles had only one chili in, this one has two, same strength of chili flavour though it still feels like winning a little prize.
Barclaycard RFID Exploring
Posted by darkskiez in Electronics, Personal on July 2, 2010
Waived my card over my Arduino Powered SM130 RFID reader to see what it would say..
Student Card: Mifare 1K(2) : 2ADEXXXX
Barclay Card: Unknown Tag(FF) : 09A1XXXX
It’s compatible with the usual RFID standards to some degree, enough to give the same serial number every time, unlike my passport which randomises its ID each activation, but not surprisingly it doesn’t read on my basic reader, probably a more advanced one would get further..
IPv6 Sage Certified
Yay, thanks to their new free DNS service, I have been able to complete Hurricane Electrics IPv6 certification course, and they are sending me a T-Shirt!
Highly recommend working your way through their course if this interests you.
New RFID Barclaycard
Posted by darkskiez in Electronics, Personal on May 20, 2010
Got a new barclaycard with RFID in the post today
I wonder if the RFID bit is MiFare compatible.. will try my reader later, not sure I’m happy about it.
The chip/pin bit seems to be compatible with my co-operative/Smile.co.uk card reader too, which surprised me but pleases me that I wont need lots of incompatible bits of junk for two-factor authentication.
Hello World
Just getting started on this blog. Cant even think of a good name for it yet, nevermind a caption =]
Don’t expect this to be wordy or regularly updated, and I expect will probably be more of a tech diary than a personal blog, but we’ll see how things develop, as I would rather facebook did not own all data about my life.
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