Friday, January 30, 2015
TC74 temperature sensor - A0, A2, A5
What's the difference between variants A0, A2, A5 of the Microchip "Tiny Serial Digital Thermal Sensor" TC74?
Simply their I2C addresses, which are 0, 2 and 5 respectively!
Source: http://ww1.microchip.com/downloads/en/DeviceDoc/21462c.pdf
Simply their I2C addresses, which are 0, 2 and 5 respectively!
Source: http://ww1.microchip.com/downloads/en/DeviceDoc/21462c.pdf
Friday, January 23, 2015
TCPDF - coordinates are measured from Top Left ...
... or to be precise:
The origin of the coordinate system is at the top-left corner (or top-right for RTL) and increasing ordinates go downwards.
The origin of the coordinate system is at the top-left corner (or top-right for RTL) and increasing ordinates go downwards.
Wednesday, January 14, 2015
Google Calendar - invitee cannot edit
When you specify a new person to be invited to share a Google Calendar (eg with editing rights) be aware that they only get sent an email (with the link to get them set up as an editor) after you press Save - just adding them to the list does nothing!
Upgrading to Windows 8.1 - "We couldn't update the System Reserved partiton"
I hit this repeatedly, and tried several suggested fixes that made no difference.
In my case, it turned out that the partition was virtually full (try Control Panel, then Computer Management, then Disk Management to see) and the solution was to increase the size of the partition. My suggestion is to grow it generously, then shrink it back most of the way (still leaving 100Mb or so free) once the installation is complete.
In my case, it turned out that the partition was virtually full (try Control Panel, then Computer Management, then Disk Management to see) and the solution was to increase the size of the partition. My suggestion is to grow it generously, then shrink it back most of the way (still leaving 100Mb or so free) once the installation is complete.
Windows 7 to 8 to 8.1 upgrade - tackling "Failure Configuring ..."
Wretched Microsoft insist that anyone with an upgrade licence from 7 to 8 must still - even with 8.1 available - update to Windows 8 first, then update Windows 8, and only then upgrade to Windows 8.1.
Can one use a Windows 8 upgrade key to upgrade direct to 8.1 - No, say their helpline.
So it is a particular misery to hit problems with the Windows 8 upgrades that Microsoft inflicts upon you - I hit "Failure Configuring Windows Updates: Reverting Changes" repeatedly as the most frequently suggested fix attempts proved to make no difference.
What worked for me?
Turning off automatic updating, then sorting the long list (140 or more) in alphabetical order (so that the "Update for Windows" files are all together in one bunch). Then click the "Name" button to unselect all the updates, and re-select the first "Update for Windows ..." updates and apply those.
Repeat until all those are done, then try the Windows Store and see if it considers your Windows 8 is in a fit state to do the 8.1 update. Mine was, having avoided all the other updates (at least one of which must have been responsible for my updates failing en masse).
Can one use a Windows 8 upgrade key to upgrade direct to 8.1 - No, say their helpline.
So it is a particular misery to hit problems with the Windows 8 upgrades that Microsoft inflicts upon you - I hit "Failure Configuring Windows Updates: Reverting Changes" repeatedly as the most frequently suggested fix attempts proved to make no difference.
What worked for me?
Turning off automatic updating, then sorting the long list (140 or more) in alphabetical order (so that the "Update for Windows" files are all together in one bunch). Then click the "Name" button to unselect all the updates, and re-select the first "Update for Windows ..." updates and apply those.
Repeat until all those are done, then try the Windows Store and see if it considers your Windows 8 is in a fit state to do the 8.1 update. Mine was, having avoided all the other updates (at least one of which must have been responsible for my updates failing en masse).
Friday, January 02, 2015
Panasonic Microwave - connections on Timer Panel
Here - for my reference as much as anyone else's - is a photo of how the connections look on the back of the timer panel on a Panasonic Microwave (my model, anyway). Note the two two-pin connector plugs: the red one goes on the inside (nearer the oven area) and the white one on the outside (nearer the outer casing). If you get them wrong, then the grill comes on when you should be microwaving (and presumably vice versa).
To remove the timer panel (I had to do this because the door release got stuck: broken plastic post), first remove the power plug - there are dangerous voltages inside a microwave. Now go and do something else for a while - voltages can be stored even after disconnection - see this useful article
Now, remove the two screws close to each other at the top, release the two white plastic tabs on the vertical edge, then pull out and upwards to release the two white plastic tabs at the bottom.
To remove the timer panel (I had to do this because the door release got stuck: broken plastic post), first remove the power plug - there are dangerous voltages inside a microwave. Now go and do something else for a while - voltages can be stored even after disconnection - see this useful article
Now, remove the two screws close to each other at the top, release the two white plastic tabs on the vertical edge, then pull out and upwards to release the two white plastic tabs at the bottom.
