====== Contactor/relay in kiln ======
Visible on front: 3RT1024-1A..0 \\
Visible on side: EAN 4 011209 291027 \\
Probably this one: \\
Siemens 3RT1024-1AP00 \\
http://www.conrad.com/ce/en/product/502380/Siemens-SIRIUS-3R-contactor-3RT1-Siemens-3RT1024-1AP00-S0-230-Vac \\
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=36-228-29&toc=0&q=3rt1024-1a \\
https://www1.elfa.se/data1/wwwroot/assets/datasheets/3RT_1015-1034_eng_tds.pdf \\
http://cache.automation.siemens.com/dnl/Tg/Tg0NzM0MQAA_6009084_HB/03_1sirius_en.pdf

Size S0 \\
Rated control supply voltage Us at 50Hz: 230

How much current is needed for A1/A2? 61/230 = 0.265A = 265mA \\
Looks like 61VA max and 7.8VA when closed according to: \\
http://docs-europe.electrocomponents.com/webdocs/058e/0900766b8058e7af.pdf

====== Thermocoule Type S sensor ======
Visible on back of TR 210: Sensor Type S and Alm \\
https://en.wikipedia.org/wiki/Thermocouple#Type_S \\
http://srdata.nist.gov/its90/type_s/0to300.html \\
http://srdata.nist.gov/its90/download/type_s.tab \\
[http://www.omega.com/temperature/z/pdf/z021-032.pdf Thermocouple theory] \\
[http://www.mosaic-industries.com/embedded-systems/microcontroller-projects/temperature-measurement/thermocouple/thermocouple-noise-filter Thermocouple Noise Filter]

====== Sensor reader ======
Thermocouple-to-Digital, type S SOIC8 MAXIM 31855 \\
MAX31855SASA+ \\
http://se.rs-online.com/web/p/temperature-humidity-sensors/7833894P/ \\
http://docs-europe.electrocomponents.com/webdocs/1252/0900766b81252ffc.pdf \\
[http://archives.sensorsmag.com/articles/1297/sw1297/main.shtml Software Linearization of a Thermocouple] \\
http://www.maximintegrated.com/en/products/analog/sensors-and-sensor-interface/MAX31855.html \\
http://www.maximintegrated.com/en/products/analog/sensors-and-sensor-interface/MAX31855PMB1.html

====== Relay with RPi ======
http://www.susa.net/wordpress/2012/06/raspberry-pi-relay-using-gpio/ \\
G5LA-1 DC5 \\
http://se.rs-online.com/web/p/non-latching-relays/0492884/ \\
http://docs-europe.electrocomponents.com/webdocs/0b76/0900766b80b76b3c.pdf \\
Trans GP BJT NPN 45V 0.8A 3-Pin TO-92 \\
http://se.rs-online.com/web/p/bipolar-transistors/6711116/ \\
http://docs-europe.electrocomponents.com/webdocs/0d22/0900766b80d22eb3.pdf \\
1N4004-E3/54, Rectifier Diode, 1A max, 400V, 2-Pin, DO-204AL \\
http://se.rs-online.com/web/p/rectifier-schottky-diodes/6289029/

===== Maybe diode is not fast enough - it is so no worries =====
Since the rise rate of the current (di/dt) of most systems is very fast (usually fractions of microseconds) "fast", "ultrafast", or Schottky diodes are used. Regular power diodes, such as the commonly used "1N4007" series, are not suitable as snubbers as their reverse recovery time (turn on time) is several tens of microseconds; the diodes do not turn on fast enough to suppress the fast voltage spike.

====== Contact and cable ======
AMP 182694-1 \\
Cable outer diameter 7.5mm \\
Cable 10 wires 2 separate shielded for thermocouple sensor \\
Contact inner diameter of dragavlastning 19mm \\
Contact (contact side) outer diameter 21.5mm \\
Lead size, outer diameter 1.5mm core diameter 0.5-0.6mm = 0.20-0.28mm2

====== Possible watchdog timer ======
Spänningsdetektorkrets SOT-23-5, STM6321LWY6F \\
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=73-457-48&toc=0&q=watchdog+timer \\
https://www1.elfa.se/data1/wwwroot/assets/datasheets/stm6321-22_6821-5_eng_tds.pdf \\
MAX823, MAX824

Watchdog-krets DIL-8, MAX813LCPA+ \\
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=73-256-24&toc=19912

WD that stays low until WDI is active MAX691CPE+ \\
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=73-691-01&toc=0

Interesting but not quite what I want \\
http://raspberrypihobbyist.blogspot.se/2014/01/fail-safe-circuit-using-discrete-logic.html

====== Also watchdog in the RPi ======
http://www.megaleecher.net/Watchdog_for_Raspberry_Pi

===== Test with G5NB-1A-E-5VDC relay =====
Elfa 37-071-60 5VDC 200mW - G5NB-1A-E-5VDC \\
Elfa 71-014-58 Transistor TO-92 NPN 45V - BC337-25 \\
Elfa 10-526-25 Likriktardiod DO-41 400V 1A - 1N4004

http://www.petervis.com/Raspberry_PI/Driving_Relays_with_CMOS_and_TTL_Outputs/Driving_Relays_with_CMOS_and_TTL_Outputs.html

Relay: 5 / 125 = 40mA needed \\
BC337-25 100mA - hFE 250 \\
40mA / 250  = 0.16mA needed for Ib base current \\
3.3 / 0.16mA = 20625 Ohm

===== Test with G4A-1A-E 5VDC relay =====
Relay: 5V / 27.8ohm = 180mA needed \\
2N4401 150mA - hFE 100 \\
180mA / 100  = 1.8mA needed for Ib base current \\
3.6 / 1.8mA = 2k Ohm (2.kOhm turns out to give ~140mA through the spool) \\
http://se.rs-online.com/web/p/non-latching-relays/6839065/

===== RS Online order - 2014-07-31 =====
^ Artikelnummer ^ Antal ^ Enhetspris ^ Varornas värde ^ Produkt ^
| 783-3894 |	1 |	70,12 kr |	70,12 kr |	Thermocouple-to-Digital, type S SOIC8 |
| 129-1320 |	1 |	29,48 kr |	29,48 kr |	TE Connectivity 182649-1, 14 Pole Male Straight Cable Mount Circular Connector, Shell Size 17,Male Contacts |
| 452-6657 |	10 |	9,795 kr |	97,95 kr |	PIN 1.5-2.5MM GOLD |
| 411-438 |	1 |	28,98 kr |	28,98 kr |	CPC cable clamp,Shell size 17A |
| 683-9065 |	2 |	34,30 kr |	68,60 kr |	SPST-NO PCB Mount Non-Latching Relay, 5V dc |

====== Logic Threshold Voltage Levels ======
http://www.interfacebus.com/voltage_threshold.html

===== More from ELFA =====
Transistor TO-92 NPN 40 V 600 mA, 2N4401 \\
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=71-300-09&toc=19104

===== Linear PSU =====
6VAC - 6VA - 2x6V, 0.5A [[https://www.elfa.se/sv/universaltransformator-6v-ac-2x-nordic-power-120129/p/15625412?q=156-25-412&page=1&origPos=1&origPageSize=50&simi=97.5|Transformer]] \\
[[http://datasheet.octopart.com/GBU405-Taiwan-Semiconductor-datasheet-34353567.pdf|GBU405]] rectifier \\
4700uF 16V \\
100uF 16V \\
.1uF ceramic \\
[[http://www.st.com/content/ccc/resource/technical/document/datasheet/c5/1b/3d/dc/81/d8/4f/d7/CD00000442.pdf/files/CD00000442.pdf/jcr:content/translations/en.CD00000442.pdf|L4940V5]] LDO voltage regulator  \\
Here are some tests - [[LinearPSUTests]]

====== Using LT1764A instead ======
===== Calculating Resitor values =====
<code>
Vout = 1.21(1+R2/R1) + Iadj * R2
Iadj = 3uA

R1=3.9k

Vout = 1.21 + 1.21 * R2/R1 + 3e-6 * R2
Vout - 1.21 = 1.21 * R2/R1 + 3e-6 * R2
R1(Vout - 1.21)/1.21 = R2 + 3e-6 * R2
R1(Vout - 1.21)/1.21 = (1 + 3E-6) * R2
(R1(Vout - 1.21)/1.21)/(1 + 3E-6) = R2
R1(Vout - 1.21)/(1.21 + 3.63E-6) = R2

Vout = 4.5 - 1.21, R1 = 3.9k
3.29 * R1/(1.21 + 3.63E-6) = R2 = 10.6k

Vout = 5.5 - 1.21, R1 = 3.9k
4.29 * R1/(1.21 + 3.63E-6) = R2 = 13.8k
</code>

===== How to get 10.6k - 13.8k with 26k trimpot? =====
Assume trimpot goes between 2.6k - 26k (not from zero)
<code>
13.8k-10.6k = 3.2k
8.2k - 5% = 7.8k
13.8k - 7.8k = 6k

1/6k-1/26k = 1/X
X = 7.8k
</code>
Use 8.2k E12 value (will get 6.2k trimpot)

So R1 = 3.9k, R2 = 8.2k + 26k || 8.2k

===== Documents =====
{{ :general:keramik:program_components.pdf | Program components }}
{{ :general:keramik:schematics_and_info.pdf | Schematics and info }}