Team Expresso BS 1001 Manuale utente

Team Expresso

BARISTA SCALES

User Guide

Model BS 1001

High precision scales

designed with baristas in mind

Published by

Nishanth Oblirajan, Ho Long Fong, Hauchan Bao and Thomas Sherborne

Contents

Welcome

System Diagram

Instructions

Specification

Circuit Diagram

Programming and Code

Welcome

Welcome to your new set of Team Expresso BS 1001 Barista Scales. These

scales are designed to sit under the brew group, fixed to the drip tray, to allow

you to measure the weight of your espresso as it is pours into your cup. It is

also the ideal tool to measure the weight of the ground coffee in a portafilter.

Also included is a timer feature so you can time how long your extraction is

taking, allowing you to perfect your coffee every time. Never again will your

coffee be too bitter or too sour as you can time everything perfectly.

Scale device: place your

cup on here for the scale to

read its weight.

The easy to adjust hinge

means you can tilt the

screen to your preferred

angle.

The grille in the scale lets

water through directly to

the drip tray so your device

doesn’t get wet.

Simply press the black

button to zero the scale

and reset the timer.

System Diagram

Low profile design doesn’t

hog space between the

brew group and drip tray.

Initialise the system using the

red button. A two button

system is easy to use and

speeds up your work.

This screen welcomes you to start

weighing your coffee by placing the

cup onto the scales

This screen will display the weight of

your coffee (excluding the cup), the

time elapsed and the flow rate.

Instructions

Using your BS 1001 Barista Scales could not be easier, just follow these simple

steps and your espresso will be perfected in no time.

1. Wake the scales from sleep mode by pressing the red button on the

screen module.

2. Place your scales on a flat stable surface.

3. Adjust the tilt of the screen to your desired level.

To use scale:

4. Place the cup or vessel on the scale before beginning your extraction

5. Press the black

button to begin the measurement of mass, you may now

begin brewing your espresso into the cup.

6. On the upper line of the screen the mass/weight in grams will be

displayed.

7. Press the red button to reset the device.

To use the timer:

4. When you begin extracting your espresso press the black button to begin

.the timer counting up.

5. On the lower line of the screen the time since you pressed the black

.button will be displayed in seconds.

6. Press the red button to reset the device.

Please note: pressing the black button will both zero the scale and reset the

timer. If you want to measure the weight of extracted espresso and time the

extraction please follow the instructions for using the timer and place your

vessel for the coffee on the scale before you press the black button.

Parameter

Min

Typ

Max

Units

Supply Voltage

3.156

3.161

3.250

Weight

142

Timer

Battery life when in use

110

121

hours

Current drain

19.7

19,9

20.1

Input Impedance

2.993

2.995

2.997

kΩ

Specification

Circuit Diagram

Below is the full circuit diagram for your BS 1001 Barista Scales.

Your barista scales are controlled by the TI MSP430G2553 Microcontroller

which is programmed in C using Energia. Find below the code used in your new

scales in case you wish to modify the scales to your personal needs.

#include!<LiquidCrystal.h>!

//initalizing!the!variables!

int!s1!=!A7;!

int!u;!

int!y;!

int!x=0;!

int!zval=732;!

int!z1,e1;!

int!eval=772;!

int!z=0;!

int!e=80;!

float!flow;!

int!rt=0;!

const!int!start=7;!

unsigned!long!stime;!

unsigned!long!time;!

unsigned!long!etime;!

//initializing!the!liquid!crystal!

LiquidCrystal!lcd(8,9,10,11,12,13);!

void!setup()!{!

!!pinMode(start,!INPUT);!

!!lcd.begin(16,!2);!

!!lcd.clear();!

void!loop()!{!

!!lcd.clear();!

!!lcd.setCursor(4,0);!

!!lcd.print("Expresso");!

!!lcd.setCursor(3,1);!

!!lcd.print("Place!cup");!

!!//if!start!button!is!pressed!

!!if(digitalRead(start)==HIGH)!

!!!!{!!

!!!!while(rt==0)!

!!!!!!{!

!!!!!!etime=millis()/1000;!

!!!!!!rt=1;!

!!!!!!}!

!!!!makezero();!

Programming and Code

!!delay(500);!

!!!!!

//program!to!zero!the!weight!scale!!!!!

void!makezero(){!!!

!!y=analogRead(s1);!

!!u=y_zval;!

!!zval+=u;!

!!eval+=u;!

!!delay(500);!

!!while(1){!

!!weight();!!}!

//displaying!the!weight,!time!and!flowrate!

void!weight(){!

!!stime=millis()/1000;!

!!lcd.clear();!

!!y=analogRead(s1);!

!!x=map(y,zval,eval,z,e);!

!!!!lcd.clear();!

!!!!lcd.print("Weight:");!

!!!!if(x<0){!

!!!!!!x=0;!

!!!!}!

!!!!lcd.print(x);!

!!!!lcd.print("g");!

!!!!lcd.setCursor(11,0);!

!!!!time=stime_etime;!

!!!!lcd.print("T:");!

!!!!lcd.print(time);!

!!!!lcd.print("s");!

!!!!space();!

!!!!lcd.setCursor(0,1);!

!!!!lcd.print("Flow:");!

!!!!flow=x/time;!

!!!!lcd.print(flow);!

!!!!lcd.print("ml/s");!

!!!!delay(500);!

!!!

//line!space!

void!space(){!

!!lcd.print("!");!!

To help you better understand your new product, this is a flow diagram of the

logic the code that your system runs on.

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