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README.md
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## Overview
This is the Arduino sketch to build a double magnetic stirrer based on 2 fans, a 1602 LCD display, a KY-040 encoder and an Arduino (e.g. Uno, Nano, Leonardo, Pro Micro).
This is the Arduino project to build a double magnetic stirrer based on 2 fans, a 1602 LCD display, a KY-040 encoder and an Arduino Nano and a special PCB designed in the Hobbybrauer-Forum.
V2 supports dual voltage for the fans which increases the speed range.
<p align="center">
<img src="https://github.com/micworg/stir/blob/master/images/stir.jpg" width=500>
<img src="https://github.com/micworg/stir2/blob/master/images/stir+pcb.jpg" width=700>
</p>
In order to put the stirrer into operation you have to change the settings in stir.ino according to your setup.
## Part List
1x PCB "Stir V2.0"
1x Arduino Nano V3
1x Voltage Regulator TE818 5-24V to 5V 3A Step Down Buck Converter
2x Relais Omron G5Q-1-EU 5DC Printrelais 5 V/DC 5A
2x Diode 1N4148 Diotec
1x Elko 1000µF/16V Yageo SE016M1000B5S-1015
2x Diode 1N5822 STMicroelectronics Schottky-Diode
4x Metallschicht-Widerstand 10 KOhm 0,6W
2x Lüfter BeQuiet SilentWings 3 120mm PWM Highspeed
(oder bisher UNGETESTET Noctua NF-R8 Redux-1800 80mm PWM)
1x Steckernetzteil 12V-20V DC / 2A
1x Einbaubuchse für Steckernetzteil
1x I2C 16x2 Arduino LCD Display Module
1x Dreh-Encoder KY-040 (mit Mutter und Drehknauf)
2x Magnethalterung (3D Druck)
4x Neodymmagnet 20x10 mm (N52, 1 oder 2 mm dick)
## Reference
This project was created based on an idea from the Hobbybrauer-Forum and would not be possible without the ideas from there.
This project was created based on an idea from the german Hobbybrauer-Forum and would not be possible without the ideas from there.
The forum: https://hobbybrauer.de/
The thread: https://hobbybrauer.de/forum/viewtopic.php?f=21&t=1456
Special thanks for development and testing:
* Herbert Schmid
* Adrian Sigel
* Jens Warkentin
* Bastian Werner
Successor project of: https://github.com/micworg/stir
## Overview of Functions
All functions are controlled by the KY-040 encoder:
@ -61,8 +93,8 @@ All functions are controlled by the KY-040 encoder:
|`PWM2`|PWM output pin for LCD brightness control|
|`I0`, `I1`|interrupts for rpm measurement (2 and 3 for Leonardo and ProMicro / 0 and 1 for Uno)|
|`CLK`, `DT`, `SW`|pins for KY-040 encoder|
|`OFF0`, `OFF1`|these pins will be set if the fan is off|
|`OFFSTATE`|off state (LOW/HIGH)|
|`R0`, `R0`|voltage select relais pin|
|`RTHRES`|voltage switch threshold (rpm)|
|`RINTERVAL`|regulation interval (ms)|
|`RDELAY`|extra regulation delay when value changes (ms)|
|`RTOL`|regulation tolerance (rpm)|
@ -73,71 +105,3 @@ All functions are controlled by the KY-040 encoder:
|`SAVEDELAY`|delay in seconds before parameter will be saved to EEPROM|
|`LCDB`|LCD brightness steps (10 values, 0=off, 255=max)|
## API commands
Commands are colon separated an can be send via USB/Serial
|Command|Description|
|:------|:----------|
|`info`|returns a colon separated string with all parameters (see below)|
|`version`|returns the software version|
|`on:<0/1>`|switch stirren on|
|`off:<0/1>`|switch stirren off|
|`bon:<0/1>`|switch boost mode on|
|`boff:<0/1>`|switch boost mode off|
|`speed:<0/1>:<rpm>`|set stirrer speed (FANMIN-FANMAX rpm)|
|`bspeed:<0/1>:<rpm>`|set stirrer boost speed (speed-FANMAX rpm)|
|`btime:<0/1>:<min>`|set boost time (0-60)|
|`con:<0/1>`|switch catch mode on|
|`coff:<0/1>`|switch catch mode off|
|`ctime:<0/1>:<min>`|set catch mode interval (60-240 min)|
|`rtime:<0/1>:<sec>`|set speed rise time (0-240 sec)|
|`rnval:<0/1>:<rpm>`|set randon value range (0-1000 rpm)|
|`otime:<0/1>:<hour>`|switch stirrer off after time in hours (1-99 hour, 0 deactivates switch off)|
All commands return a colon separated string with all current parameters:
|Element|Stirrer|Variable in stir.ino|Description|
|:------|:------|:-------------------|:----------|
| 0|0|`F[0]` |state (0=on, 1=off)|
| 1|0|`v[0]` |speed (rpm)|
| 2|0|`b[0]` |boost speed (rpm)|
| 3|0|`rpm[0]` |rpm|
| 4|0|`xpm[0]` |averaged rpm|
| 5|0|`r[0]` |regulation value|
| 6|0|`bstate[0]`|boost state (0=on, 1=off)|
| 7|0|`btime[0]` |boost time (min)|
| 8|0|`cat[0]` |fish catch mode state (0=on, 1=off)|
| 9|0|`ctime[0]` |fish catch time interval (min)|
|10|0|`rtime[0]` |speed rise time (sec)|
|11|0|`otime[0]` |switch off time (hour)|
|12|0|`rnval[0]` |random value range (rpm)|
|13|0|`rnd[0]` |current random value (rpm)|
|14|0| |boost remain (sec)|
|15|0| |off timer remain (sec)|
|16|1|`F[1]` |state (0=on, 1=off)|
|17|1|`v[1]` |speed (rpm)|
|18|1|`b[1]` |boost speed (rpm)|
|19|1|`rpm[1]` |rpm|
|20|1|`xpm[1]` |averaged rpm|
|21|1|`r[1]` |regulation value|
|22|1|`bstate[1]`|boost state (0=on, 1=off)|
|23|1|`btime[1]` |boost time (min)|
|24|1|`cat[1]` |fish catch mode state (0=on, 1=off)|
|25|1|`ctime[1]` |fish catch time interval (min)|
|26|1|`rtime[1]` |speed rise time (sec)|
|27|1|`otime[1]` |switch off time (hour)|
|28|1|`rnval[1]` |random value range (rpm)|
|29|1|`rnd[1]` |current random value (rpm)|
|30|1| |boost remain (sec)|
|31|1| |off timer remain (sec)|
|32| | |software version|
|33| | |uptime (ms)|
|34| | |0=ok, 1=error|
## Schematics
<p align="center">
<img src="https://github.com/micworg/stir/blob/master/images/schematic_leonardo.png" width=500>
<img src="https://github.com/micworg/stir/blob/master/images/schematic_uno.png" width=500>
</p>

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# Dual magnetic stir controller
## Overview
This is the Arduino sketch to build a double magnetic stirrer based on 2 fans, a 1602 LCD display, a KY-040 encoder and an Arduino (e.g. Uno, Nano, Leonardo, Pro Micro).
<p align="center">
<img src="https://github.com/micworg/stir/blob/master/images/stir.jpg" width=500>
</p>
In order to put the stirrer into operation you have to change the settings in stir.ino according to your setup.
## Reference
This project was created based on an idea from the Hobbybrauer-Forum and would not be possible without the ideas from there.
The forum: https://hobbybrauer.de/
The thread: https://hobbybrauer.de/forum/viewtopic.php?f=21&t=1456
## Overview of Functions
All functions are controlled by the KY-040 encoder:
* **Short Press:** change between menu, stirrer 1 and stirrer 2
* **Turn when menu is selected**: change between menu items (SPEED, BOOST, BTIME, CATCH, CTIME)
* **Long press when menu is selected**: lock all functions (unlock also by long press)
* **When a stirrer is selected**:
* **SPEED**: turn sets speed, long press switches stirrer on or off.
* **BOOST**: turn sets boost speed, long press activates/deactivates the boost function (running time is shown in the display).
* **BTIME**: turn changes the boost time in minutes.
* **CATCH**: turn activates/deactivates the fishing function
* **CTIME**: turn changes the interval in minutes for the fish catching function
* **RTIME**: turn changes speed rise time in seconds (applies to power on, stirrer on, boost on and fish catching)
* **OTIME**: turn changes switch off time in hours (the timer activates immediately, 0 = switch off disabled)
* **RNVAL**: random value range (a random values in this range will be added to speed)
* **Other menu options**:
* **BRGHT**: LCD brightness
## Display Indicators:
* **Bottom Left**: Menu
* **Bottom Center/Right**: displays the set values for the stirrers depending on the selected menu item.
* **Top Center/Right**: displays the current stirrer speed (or 'OFF' or 'CAT' (Fishing)).
* **Top Left**: shows the remaining time of the boost or switch off function.
## Settings (in stir.ino)
|Value|Description|
|:----|:----------|
|`SPEEDINC`|increment of speed values when turning the encoder|
|`FANMIN`|fan minimum speed (should be a value at which the fan runs safely) (rpm)|
|`FANMAX`|maximum speed of the fan (it is important that this is the real maximum value of the fan) (rpm)|
|`BOFF`|if set boost off will also turn the normal mode off|
|`BINC`|boost time increment (min)|
|`CINC`|catch time increment (min)|
|`RINC`|rise time increment (sec)|
|`OINC`|off timer increment (hour)|
|`CATCHSTOP`|stop interval for stir fish catch function (ms)|
|`PWM0`, `PWM1`|PWM output pins for fan speed|
|`PWM2`|PWM output pin for LCD brightness control|
|`I0`, `I1`|interrupts for rpm measurement (2 and 3 for Leonardo and ProMicro / 0 and 1 for Uno)|
|`CLK`, `DT`, `SW`|pins for KY-040 encoder|
|`OFF0`, `OFF1`|these pins will be set if the fan is off|
|`OFFSTATE`|off state (LOW/HIGH)|
|`RINTERVAL`|regulation interval (ms)|
|`RDELAY`|extra regulation delay when value changes (ms)|
|`RTOL`|regulation tolerance (rpm)|
|`RNDINTERVL`|randon value range change interval (ms)|
|`SINTERVAL`|speed measurement interval (ms)|
|`SAVERAGE`|speed measurement average|
|`SAVETAG`|parameter save identifier|
|`SAVEDELAY`|delay in seconds before parameter will be saved to EEPROM|
|`LCDB`|LCD brightness steps (10 values, 0=off, 255=max)|
## API commands
Commands are colon separated an can be send via USB/Serial
|Command|Description|
|:------|:----------|
|`info`|returns a colon separated string with all parameters (see below)|
|`version`|returns the software version|
|`on:<0/1>`|switch stirren on|
|`off:<0/1>`|switch stirren off|
|`bon:<0/1>`|switch boost mode on|
|`boff:<0/1>`|switch boost mode off|
|`speed:<0/1>:<rpm>`|set stirrer speed (FANMIN-FANMAX rpm)|
|`bspeed:<0/1>:<rpm>`|set stirrer boost speed (speed-FANMAX rpm)|
|`btime:<0/1>:<min>`|set boost time (0-60)|
|`con:<0/1>`|switch catch mode on|
|`coff:<0/1>`|switch catch mode off|
|`ctime:<0/1>:<min>`|set catch mode interval (60-240 min)|
|`rtime:<0/1>:<sec>`|set speed rise time (0-240 sec)|
|`rnval:<0/1>:<rpm>`|set randon value range (0-1000 rpm)|
|`otime:<0/1>:<hour>`|switch stirrer off after time in hours (1-99 hour, 0 deactivates switch off)|
All commands return a colon separated string with all current parameters:
|Element|Stirrer|Variable in stir.ino|Description|
|:------|:------|:-------------------|:----------|
| 0|0|`F[0]` |state (0=on, 1=off)|
| 1|0|`v[0]` |speed (rpm)|
| 2|0|`b[0]` |boost speed (rpm)|
| 3|0|`rpm[0]` |rpm|
| 4|0|`xpm[0]` |averaged rpm|
| 5|0|`r[0]` |regulation value|
| 6|0|`bstate[0]`|boost state (0=on, 1=off)|
| 7|0|`btime[0]` |boost time (min)|
| 8|0|`cat[0]` |fish catch mode state (0=on, 1=off)|
| 9|0|`ctime[0]` |fish catch time interval (min)|
|10|0|`rtime[0]` |speed rise time (sec)|
|11|0|`otime[0]` |switch off time (hour)|
|12|0|`rnval[0]` |random value range (rpm)|
|13|0|`rnd[0]` |current random value (rpm)|
|14|0| |boost remain (sec)|
|15|0| |off timer remain (sec)|
|16|1|`F[1]` |state (0=on, 1=off)|
|17|1|`v[1]` |speed (rpm)|
|18|1|`b[1]` |boost speed (rpm)|
|19|1|`rpm[1]` |rpm|
|20|1|`xpm[1]` |averaged rpm|
|21|1|`r[1]` |regulation value|
|22|1|`bstate[1]`|boost state (0=on, 1=off)|
|23|1|`btime[1]` |boost time (min)|
|24|1|`cat[1]` |fish catch mode state (0=on, 1=off)|
|25|1|`ctime[1]` |fish catch time interval (min)|
|26|1|`rtime[1]` |speed rise time (sec)|
|27|1|`otime[1]` |switch off time (hour)|
|28|1|`rnval[1]` |random value range (rpm)|
|29|1|`rnd[1]` |current random value (rpm)|
|30|1| |boost remain (sec)|
|31|1| |off timer remain (sec)|
|32| | |software version|
|33| | |uptime (ms)|
|34| | |0=ok, 1=error|
## Schematics
<p align="center">
<img src="https://github.com/micworg/stir/blob/master/images/schematic_leonardo.png" width=500>
<img src="https://github.com/micworg/stir/blob/master/images/schematic_uno.png" width=500>
</p>

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$fn=128;
g = 10; // magnet gap
fw = 48.3; // fan width
h = 4; // base height
r = 5; // edge width
pn = 7; // number of pins
ph = 7; // pin height
pa = 20; // pin angle
mw = 10.25; // magnet width
ml = 20.25; // magnet length
mb = 17; // magnet bar width
d=fw+r+r; // total diameter
cl=d-r; // magnet bar length
a=360/pn; // segment angle
e=(d+g-10)/d; // elliptic scale factor
difference() {
union() {
difference() {
union() {
translate([0,0,0]) cylinder(h+ph,d/2,d/2);
translate([0,0,0]) scale([e, 1, 1]) cylinder(h,d/2,d/2);
}
translate([0,0,-1]) cylinder(h+ph+2,d/2-r,d/2-r);
for (i =[0:1:pn-1]) {
pin(a*i);
}
}
translate([-cl/2,-mb/2,0]) cube([cl,mb,h]);
rotate ([0,0,90]) translate([-cl/2,-(mb-mw)/4-d/7,0]) cube([cl,(mb-mw)/2,h]);
rotate ([0,0,90]) translate([-cl/2,-(mb-mw)/4+d/7,0]) cube([cl,(mb-mw)/2,h]);
}
translate([-ml-g/2,-mw/2,-1]) cube([ml,mw,h]);
translate([g/2,-mw/2,-1]) cube([ml,mw,h]);
}
module pin(r) {
translate([0,0,0.01]) rotate([0,0,r]) hull() {
translate([0,0,h]) cylinder(h+ph,0.1,0.1);
translate([-d,0,h]) cylinder(h+ph,0.1,0.1);
rotate ([0,0,a-pa])union() {
translate([0,0,h]) cylinder(h+ph,0.1,0.1);
translate([-d,0,h]) cylinder(h+ph,0.1,0.1);
}
}
}

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# CAD Files
CAD files for 3D printed magnet holder. Compatible for magnets with size 20x10x5 mm and
*be quiet! Silent Wings 3 140 mm* fans.
CAD files for 3D printed magnet moun. Compatible for magnets with size 20x10x5 mm and
*be quiet! Silent Wings 3 120/140 mm* fans.
<p align="center">
<img src="https://github.com/micworg/stir/blob/master/images/magnetmount.jpg" width=500>

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/// magnet mount for for magnets with size 20x10x5 mm and be quiet! Silent Wings 3 120/140 mm fans
$fn=128;
g = 10; // magnet gap
fan = 120; // fan size (120 or 140)
h = 4; // base height
r = 5; // edge width
pn = 7; // number of pins
ph = 7; // pin height
pa = 20; // pin angle
mw = 10.25; // magnet width
ml = 20.25; // magnet length
mb = 17; // magnet bar width
fw= fan==140 ? 48.3 : 42.5; // fan center width
eo= fan==140 ? 10 : 5; // elliptic extra offset
d=fw+r+r; // total diameter
cl=d-r; // magnet bar length
a=360/pn; // segment angle
e=(d+g-eo)/d; // elliptic scale factor
difference() {
union() {
difference() {
union() {
translate([0,0,0]) cylinder(h+ph,d/2,d/2);
translate([0,0,0]) scale([e, 1, 1]) cylinder(h,d/2,d/2);
}
translate([0,0,-1]) cylinder(h+ph+2,d/2-r,d/2-r);
for (i =[0:1:pn-1]) {
pin(a*i);
}
}
translate([-cl/2,-mb/2,0]) cube([cl,mb,h]);
rotate ([0,0,90]) translate([-cl/2,-(mb-mw)/4-d/7,0]) cube([cl,(mb-mw)/2,h]);
rotate ([0,0,90]) translate([-cl/2,-(mb-mw)/4+d/7,0]) cube([cl,(mb-mw)/2,h]);
}
translate([-ml-g/2,-mw/2,-1]) cube([ml,mw,h]);
translate([g/2,-mw/2,-1]) cube([ml,mw,h]);
}
module pin(r) {
translate([0,0,0.01]) rotate([0,0,r]) hull() {
translate([0,0,h]) cylinder(h+ph,0.1,0.1);
translate([-d,0,h]) cylinder(h+ph,0.1,0.1);
rotate ([0,0,a-pa])union() {
translate([0,0,h]) cylinder(h+ph,0.1,0.1);
translate([-d,0,h]) cylinder(h+ph,0.1,0.1);
}
}
}

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