Thermocouple - Revision history

Rew: /* Protocol */

2019-05-10T10:40:09Z

Protocol

Rew: /* Overview */

2019-05-10T10:38:51Z

Overview

Rew: /* Specifications */

2019-05-10T10:38:26Z

Specifications

Cartridge1987: /* Pinout */

2015-11-06T11:31:22Z

Pinout

Cartridge1987: /* Overview */

2015-11-06T11:17:26Z

Overview

Cartridge1987 at 11:08, 6 November 2015

2015-11-06T11:08:33Z

Cartridge1987 at 10:35, 6 November 2015

2015-11-06T10:35:03Z

Cartridge1987: /* THIS WIKI IS WORK IN PROGRESS */

2015-11-06T08:37:15Z

THIS WIKI IS WORK IN PROGRESS

Cartridge1987 at 16:32, 5 November 2015

2015-11-05T16:32:23Z

Cartridge1987: /* Overview */

2015-11-05T16:30:37Z

Overview

@@ Line 82: / Line 82: @@
 The general overview of the protocol is [[General_SPI_protocol|here]].
-The specific commands for the Thermocouple PCB are explained on the page about the spi_dio board, as the two boards share the same protocol: [[DIO_protocol]] . Where the SPI_DIO drives an output high, the Thermocouple board will drive the output pin LOW when the pin is driven active.
+The specific commands for the Thermocouple PCB are explained on the page about the spi_dio board, as the two boards share the same protocol: [[DIO_protocol]] .
 For arduino, a sample PDE is available, called ardemo_lcd.pde, also at [http://www.bitwizard.nl/software the BitWizard software download directory] .

@@ Line 5: / Line 5: @@
 == Overview ==
-The Thermocouple has a low voltage of 75mV. The low voltage is temperature sensitive, so that makes it possible to read the temperature with it.
+The Thermocouple has a low voltage of max about 75mV. The low voltage is temperature sensitive, so that makes it possible to read the temperature with it.
 The board has 4 pins, which can be changed to input or output.

@@ Line 13: / Line 13: @@
 None: the board comes fully assembled.
-== Specifications ==
-Although the specifications for the FETs allow a larger current, it is not recommended to exceed the 1A as the contacts of the connectors are not rated for so much, also the PCB is not equipped for such large currents. But if you need to drive several loads in sequence 1A per port is comfortably possible.
-The manufacturer specifies the maximum current for the case where each fet has the whole board available as a heatsink.
 === Possible Configurations ===

@@ Line 37: / Line 37: @@
 For the SPI connector see: [[SPI_connector_pinout]].
+Normal measurements would return a value of 0 for 0V up to 1023 for the reference value.
-The output connector is connected as follows:
 {| border=1
-! pin !! function !!
+! value !!   thermo
 |-
-| 1 || DEV POWER ||
+| 0x00     || T4
 |-
-| 2 || OUT0 ||
+| 0x01     || T3
 |-
-| 3 || DEV POWER ||
+| 0x02     || T2
+|-
+| 0x03     || T1
 |-
-| 4 || OUT1 ||
 |}
@@ Line 56: / Line 58: @@
 Use a connector on 1-2 to provide a more powerful power source for the devices that the board drives.
+More info you can read at [[analog inputs]].
 === LEDs ===

@@ Line 4: / Line 4: @@
 == Overview ==
+The Thermocouple has a low voltage of 75mV. The low voltage is temperature sensitive, so that makes it possible to read the temperature with it.
 The board has 4 pins, which can be changed to input or output.

@@ Line 12: / Line 12: @@
 == Specifications ==
-The 7FETS board is capable of sinking about 1A per output. We have tested 1.25A and the FET became slightly warm, as predicted by theory.
 Although the specifications for the FETs allow a larger current, it is not recommended to exceed the 1A as the contacts of the connectors are not rated for so much, also the PCB is not equipped for such large currents. But if you need to drive several loads in sequence 1A per port is comfortably possible.
@@ Line 41: / Line 39: @@
 ! pin !! function !!
 |-
 | 1 || DEV POWER ||
 |-
 | 2 || OUT0 ||
@@ Line 48: / Line 46: @@
 |-
 | 4 || OUT1 ||
-|-
-| 5 || DEV POWER ||
-|-
-| 6 || OUT2 ||
-|-
-| 7 || DEV POWER ||
-|-
-| 8 || OUT3 ||
-|-
-| 9 || DEV POWER ||
-|-
-| 10 || OUT4 ||
-|-
-| 11 || DEV POWER ||
-|-
-| 12 || OUT5 ||
-|-
-| 13 || DEV POWER ||
-|-
-| 14 || OUT6 ||
 |}
@@ Line 83: / Line 61: @@
 The connector SV2 allows you to connect the "power source".
-You can chose two configurations: You can use pin 1-2 as ground and power. You can connect up to 15V (*) to pin 2 referenced to GND on pin 1.
 (*) The datasheet for the used transistors mentions "20V", but is is always prudent to keep some margin.
@@ Line 90: / Line 66: @@
 If you want 5V as the power source, you could put a jumper on pin 2-3. In that case you will have to be aware that you're using the 5V power from the rest of the system. This will be limited by e.g. USB power limits, other devices on the SPI bus, cable thickness and connector capability. But for low-current 5V applications this might be useful.
-== jumper settings ==
+== Jumper settings ==
 See [[solder jumpers]] on how to change the solder jumper.
@@ Line 96: / Line 72: @@
 By changing the solder jumper SJ1, you can make the connector nearest the board edge into the ICSP programming connector for the attiny44 on the board.
-== powering 7fets ==
+== Powering Thermocouple ==
-Although some BitWizard boards will work with 3.3V as the power supply, the 7fets board needs to be supplied with 5V as this voltage is used to drive the FETs. If you need operation at 3.3V, [http://www.bitwizard.nl/contact.php contact] us: we can find FETs to populate the boards with that work at 3.3V.
+Although some BitWizard boards will work with 3.3V as the power supply, the Thermocouple board needs to be supplied with 5V as this voltage is used to drive.
 == Protocol ==

@@ Line 1: / Line 1: @@
 [[File:Thermocouple.jpg|thumb|300px|The Thermocouple (I2C version)]]
 This is the documentation page for the Thermocouple, that you can buy in the [http://www.bitwizard.nl/shop/expansion-boards/thermocouple BitWizard shop].
@@ Line 30: / Line 25: @@
 === Datasheets ===
-[http://www.irf.com/product-info/datasheets/data/irfml8244pbf.pdf The FETs]
 == Additional software ==
@@ Line 100: / Line 95: @@
 By changing the solder jumper SJ1, you can make the connector nearest the board edge into the ICSP programming connector for the attiny44 on the board.
 == powering 7fets ==
@@ Line 108: / Line 102: @@
 == Protocol ==
-To make the 7FETS PCB do things, you need to send things over the SPI or I2C bus to the PCB.
+To make the Thermocouple be useful, you need to send things over the SPI or I2C bus to the PCB.
 The general overview of the protocol is [[General_SPI_protocol|here]].
-The specific commands for the 7fets PCB are explained on the page about the spi_dio board, as the two boards share the same protocol: [[DIO_protocol]] . Where the SPI_DIO drives an output high, the 7fets board will drive the output pin LOW when the pin is driven active.
+The specific commands for the Thermocouple PCB are explained on the page about the spi_dio board, as the two boards share the same protocol: [[DIO_protocol]] . Where the SPI_DIO drives an output high, the Thermocouple board will drive the output pin LOW when the pin is driven active.
 For arduino, a sample PDE is available, called ardemo_lcd.pde, also at [http://www.bitwizard.nl/software the BitWizard software download directory] .
-This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for the dio and 7fets boards as well.
+This is a demo to send things using SPI to the lcd board. The SPI routines there are applicable for the dio and Thermocouple boards as well.
 == The software ==

← Older revision		Revision as of 08:37, 6 November 2015
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	== THIS WIKI IS WORK IN PROGRESS ==

@@ Line 5: / Line 5: @@
 == Overview ==
+The board has 4 pins, which can be changed to input or output.
-The board has 7 fets that allow you to pull a pin of a load low. You would normally tie the other end of your load directly to the powersupply.
-About 1A per output should be possible. Maximum voltage is 20V. [http://www.bitwizard.nl/contact.php Contact] us if you require a larger voltage.
-You will have to provide your own protection circuits (freewheeling diodes) if you are going to drive inductive loads (like a motor).
 == Assembly instructions ==