Just got a donation of nice part bins, been logging all parts in http://ecdb.net/login.php . Pain in the neck but it's got to be done, already I am able to find parts easier. 720 bins down and logged only 1000 left!
Wednesday, May 29, 2013
Friday, May 24, 2013
We won another grant!!
From: Dodd, Tim (ANF)
Sent: Wednesday, May 22, 2013 5:25 PM
To: Dodd, Tim (ANF)
Subject: Important Information- Vocational School Equipment Grant Announcement
Sent: Wednesday, May 22, 2013 5:25 PM
To: Dodd, Tim (ANF)
Subject: Important Information- Vocational School Equipment Grant Announcement
Congratulations
on being slated to receive grant funding through the Vocational
Equipment Grant program! This email provides logistical information
about the event this coming Wednesday as well next steps in the contract process.
*Please
remember that this information is embargoed and please do not share it
outside of school administrators and program teachers.*
Vocational Equipment Grant Program
Announcement Event
Massachusetts State House
Room 157
Wednesday, May 29, 2013
1:30PM
Event Location:
The
event will take place in room 157 of the Massachusetts State House.
Enter through the “Hooker Entrance” at the front of the State House on
Beacon St. After going through security, turn left. At the first bank
of elevators, take a right and go down a very short flight of stairs.
Room 157 will be on the right. Please give yourself a few extra minutes
to go through security, especially as it is school group season here at
the State House.
Transportation
If
you are taking public transportation, the State House is easily
accessible by the Red or Green lines through the Park Street Station or
the Orange line through the Downtown Crossing Station. The State House
is a five minute walk up the hill.
If
you are driving into the city, there are several parking garages
located within a few blocks of the State House. A database of parking
garages, locations, and rates is available at: http://boston.bestparking.com.
RSVP
If possible, please email me to RSVP for this event with an estimated number of individuals who will be attending by Friday at 5:00PM.
Please let me know if your school will not be represented at the event
so that I can contact you by email or phone to discuss the contract
process.
Contract Process Meeting
After the event, I will hold a short meeting for recipients to discuss the contract process.
Please do not hesitate to contact me should you have any additional questions. I hope to see you on Thursday, and I look forward to working with you!
Best,
Tim
Tim Dodd
Local Government Program Manager
Executive Office for Administration and Finance
State House Room 373
Boston, MA 02133
Follow us on Twitter: @MassANF
For information on the Community Innovation Challenge grant program, please visit the program website:
To join the Community Innovation Challenge grant interest list, send an email to:
join-fad-cicgrants@listserv.Tuesday, May 14, 2013
Precision LUX Detector
Here is a design I made for a friend
who wanted an white LED to turn on when it was dusk, but also wanted
so adjustment via a pot. So off to pick a photocell, I picked a
VT9ØN3 that was used in many low light applications.
Found this great app note at
http://www.ladyada.net/media/sensors/APP_PhotocellIntroduction.pdf
turns out there are as couple of types
of photocells the Ø material and the 3 material
Type Ø Material
This is a general purpose material. Its
characteristics include a good temperature coefficient and fast
response time, especially at very low light levels. Cells of this
type have relatively low dark history. Type Ø material is often used
in lighting controls such as nightlights, and security lighting
Type 3 Material
This is a high speed material with a
spectral response closely approximating the human eye. This material
is well suited for switching from one light level to another and
offers our best temperature stability and response time. This
material is often used in cameras and industrial controls.
Once ordered we tested the photocell
characteristic curve and found the following:
Now the circuit we chose was a op-amp
comparator type, this was a great circuit because we used a JFET
input opamp the TL072 and current consumption was less than 1ma (our target current) and
have a very crisp trigger level unlike using a single transistor or
FET. We used a 25 turn precision pot to get the accuracy down to +/-
1 LUX at the set-point. In-fact a voltage of 1.625 at pin 3
(reference) was ideal for dusk at 7pm local, the photocell read about
130k ohms indoors at dusk shades open with 5.25 sqft total window
area facing east+west (2.625 sqft ea) approximately 3 to 4 LUX
The protocircuit below:
Video of the circuit working:
Subscribe to:
Posts (Atom)