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'Exciting Freelance job opportunity for Designer/Pr'
|Dear Electronic designer,
Unisar is a consumer product company based in New York City.
We have an opportunity for a Designer/Programmer with PIC experience to
pick-up a Coffee Roaster (Control) project in mid-stream. We need fast
worker who can show a track record of meeting and beating tough deadlines.
If you have experience controlling motors and heating with the PIC email us
The project is a "smart" Coffee Roaster for the home.
The first product of its kind! and will be driven by a PIC 16C711.
The product has already won a Design Innovation Award at the Consumer
Electronics Show in Las Vegas 1997; with more honors to come. This product
will be the first of a series of first of their kind coffee products.
So get on-board and ride the rocket!
The circuit is designed, but not de-bugged.
The software is roughed out, but not optimized.
We have mechanical parts to build an alpha batch of 5 units for
We are poised on the brink of success.
The perfect opportunity for a Designer/Programmer with PIC experience to be
We supply large amounts of gourmet coffee for "testing", just one of many
perks! (If you don't drink coffee thats o.k. too!)
If this challenge is for you and you love coffee and smart little
Email your resume, Previous Successful Project info and hourly rate
Coffee Lovers UNITE!
Here is a description of the project:
Main circuit elements:
1. The PIC16C711, an 8-bit eprom based microcontroller which features
on-board a/d convertors and high-current i/o.
2. A precision thermistor probe inside the roaster which monitors the
temperature. This is used with a precision resistor to create an analog
voltage level which is read by the microcontroller's a/d converter.
3. A NiChrome wire based heater element.
4. A fan which forces air past the heater and through the roaster. It is
controlled by a triac, a solid-state switch which allows variable speed as
well as on/off control.
5. A potentiometer which indicates the level of cooking desired by the
user. It sets an analog voltage level which is read by the a/d converter
and translated into a "cooking quanta" target value.
6. A SPST switch which is the start/stop button.
7. Three LEDs for status indication.
C. System function overview:
On power-up, the system enters the ready mode, in which it illuminates t
green LED and waits for a button press.
When the button is pressed, the system enters cook mode, in which the re
LED is illuminated, the heater is turned on, and the fan is run at a high
rate. Periodically, the control knob is read, and a desired cooking quanta
target value is calculated (based on a practical minimum and maximum).
Second, the temperature in the roaster is read, and each successive
temperature reading is added to a running total. This represents the total
heat energy to which the food has been exposed during this cooking cycle.
The fan speed is slowed over the course of the cooking to compensate for
the foods lessening thermal mass as moisture content is reduced.
When the total cooking quanta matches the user set value, or if the user
presses the start/stop button, the system enters cool mode. The heater is
switched off and the blue LED is illuminated. This mode runs for a set
period, and user input is ignored. After room temp is reached or a maximum
cooling period has passed, the system resets to the ready mode.
Electronic hardware overview:
Microcontroller: The PIC16C711-4 by Microchip is an 8-bit eprom based RISC
micocontroller rated for operation to 4MHz. It features a 4 channel, 8-bit
a/d converter, and thirteen bi-directional i/o lines each capable of
sourcing up to 20mA of current. This is an OTP device, that is, it
contains on-chip program memory which is blank, and it is batch programmed,
as needed, with the control system code. The final nature of this code is
dependent upon the particular components used in production, so the chips
MUST be programmed and tested thoroughly in conjunction with production,
and at each critical component.
Oscillator: This design calls for a main clock rate of 4Mhz. The
oscillator can be formed by either a ceramic resonator with internal or
external capacitors, or a crystal and capacitors.
Heater control: The relay used to control the heater is a high efficiency
type, so the PIC can drive it directly by doubling up on its output lines.
Fan control: The fan motor used in this prototype is a 120v DC motor which
is powered by the AC line through a diode bridge. It is treated by the
system exactly as if were an AC motor. The PIC monitors the AC line
voltage. Each time the alternating voltage passes through the zero point,
the PIC sends a trigger pulse to a triac which drives the fan motor. The
amount of delay between the zero crossing and the motor trigger determines
the fan speed.
Eric van Es
Matt Fisher wrote:
> We are poised on the brink of success.
Big mouth, eh? Nothing wrong with lots of self-confidance....I guess.
> The perfect opportunity for a Designer/Programmer with PIC experience to be
> a HERO.
I wanna be a super hero. Call Batman (aka PICMAN) ;-)
> Here is a description of the project:
Cool! Now we can all build ourselves one! <G>
Eric van Es | Cape Town, South Africa
ilink.nis.za | vaneshttp://www.nis.za/~vanes
LOOKING FOR TEMPORARY / HOLIDAY ACCOMODATION?
From: Matt Fisher <TRAKKER.COM> mfisher
To: MITVMA.MIT.EDU < PICLISTMITVMA.MIT.EDU> PICLIST
Date: Tuesday, 4 November 1997 11:17
Subject: Exciting Freelance job opportunity for Designer/Programmer with PIC
Well, put me on the mailing list when you get it in production - I want one!
Sick of stale coffee!
> We supply large amounts of gourmet coffee for "testing", just one of many
>perks! (If you don't drink coffee thats o.k. too!)
<groan!> That was a terrible pun!
Say, can I be a Beta coffee tester?
>If this challenge is for you and you love coffee and smart little
>Email your resume, Previous Successful Project info and hourly rate
I do, but I'm somewhat occupied.
Say, can ppl buy coffee beans in the green state (not Tasmania) without
having to buy 50kg?
'[PICLIST] Job opportunity'
|part 1 3091 bytes content-type:multipart/alternative; (decoded quoted-printable)
te mando o CV por email ?
----- Original Message -----
From: "Dinho AeS" <AES.COM.BR> agrj
To: <MITVMA.MIT.EDU> PICLIST
Sent: Wednesday, June 12, 2002 5:29 PM
Subject: Job opportunity
Anyone in this list, who lives in Brazil, are interested in work with
Aryldo G Russo Jr
Gerente de Pesquisa e Desenvolvimento
AeS Automagco e Sistemas Ltda.
Rua Domingos Barbieri, 294/298
05531-060 - Sco Paulo/SP
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