Application Notes

Newest Notes.

• Use of Timer0 - PICAXE-08M (In progress).
• Use of a Microchip TC4469 Quad FET Driver to Control a Bipolar Stepper
• Interfacing with a Microchip MCP3202 Dual 12-bit A/D using Hardware SPI
• Interfacing with MCP3421 / MCP3422 / MCP3424 18-bit Sigma Delta A/Ds
• Interfacing with a MLX90614 IR Temperature Sensor
• Linearizing an NTC Thermistor to Simplify Calculations
• Interfacing with an AHT11 Analog Humidity Temperature Sensor
• Measuring Distance with an SR04 Ultrasonic Rangefinder
• Interfacing with a Two Wire LED Display

I have been developing application notes and selling items to hobbyists via the web for the past 15 years. Your purchases help me to develop additional applications.

If an order is received by noon, Eastern Time, it is virtually always shipped the same day.

I strive to keep my prices low and believe my shipping is the least expensive.

I have no minimum order.

Shipping to the US and to Canada are calculated by my PayPal account based on the amount of the order. This is $1.95 and up. Usually less than $5.00. You can see amount for shipping change as you add items to your cart. Canada is a bit more expensive than the US.

I also ship to Belgium, Germany, Ireland, Liechtenstein, New Zealand, Denmark, South Africa, Austria, Iceland, Greenland, United Kingdom, Australia, Sweden, France, Israel, Netherlands, Norway, Finland, Luxembourg. The amount is calculated by my PayPal account.

I do not ship to other places such as Africa and South or Central America. Consider using SkyBox in Miami.

PayPal will add 6 percent sales tax for Maryland residents.

Please note that I am a PICAXE distributor.

July 1, 2011. The new PICAXE-08M2, -14M2 and -20M2 are now available here. Tell your friends!

PICAXE-M2 Product Briefing

A new book by noted Nuts & Volts author Ron Hackett.

Amazon Link: PICAXE Microcontroller Projects for the Evil Genius

NEW. I now have this book in stock. If your total order including this item is $30.00. - $9.95. Note that both your order and the book will be sent Priority Mail. Note that this offer is US Only. It is too expensive for me to mail to other countries. Sorry.

New.

AXE133Y - Budget Serial OLED Display. 16X2, Kit, Uses a preprogrammed PICAXE-18M2 (included with kit). Datasheet
Please do not confuse this with my LCD #117. $21.95.

PICAXE Processors.

• PICAXE-08M2 (8-pin DIP)

  Quan (per)	Total	-
  3 ($2.65)	$7.95
  10 ($2.49)	$24.90
  100 ($2.25)	$225.00

• PICAXE-14M2 (14-pin DIP)

  Quan (per)	Total	-
  3 ($3.95)	$11.85
  10 ($3.75)	$37.50

• PICAXE-18M2 (18-pin DIP).

  Quan (per)	Total	-
  3 ($4.25)	$12.75
  10 ($3.95)	$39.50

• PICAXE-20M2 (20-pin DIP)

  Quan (per)	Total	-
  3 ($4.25)	$12.75
  10 ($3.95)	$39.50

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• PICAXE-20X2 (20-pin DIP)

  Quan (per)	Total	-
  2 ($5.95)	$11.90
  5 ($5.65)	$28.25

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• PICAXE Assortment. Three PICAXE-08M2, two PICAXE-14M2, two PICAXE-18M2, two PICAXE-20M2 - $29.95.

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  I now have the -28X2 and the -40X2 using the PIC18F25K22 and PIC18F45K22. Upgrade Notice.

• PICAXE-28X2 (28-pin DIP, 0.3 inch wide)- $10.95.

• PICAXE-40X2 - $10.95. (Out of stock).

Rev-Ed Project Boards. Note that soldering is required in assembling the Rev-Ed project boards.

• 

  PICAXE-28X2 AXE401-KIT Shield Kit. $17.95

  

• AXE181 Touch Sensor Demo Board - $16.95

• Rev-Ed AXE021 - PICAXE-08 Proto Board Kit

  

  A small self assembly board to allow rapid prototyping of PICAXE-08 circuits. Includes all components including download socket, socket for the PICAXE-08M, resistors for download and battery clip. Purchase PICAXE-08M separately. You may also require a battery holder and either an AXE-026 serial or AXE-027 USB download cable or with the adaptor shown below. $4.49.

More Rev-Ed Items

Note that the following items are not products of and are not manufactured by Revolution Education in the UK.

• 

• Modern Device USB to Serial Board. (This standalone unit is no longer offered. Rather, use the PICAXE-USB packages described below.)

  This assembled board from Modern Device provides a good deal of flexibility in interfacing your PC USB port with the PICAXE. Note that I have programmed the FTDI FT245R to provide the necessary inversions of TX and RX to directly interface with the PICAXE.

  Instructions and Schematic. With Configuration #1 note that you have access to +5 VDC, GRD, TX and RX. You can simply interface with your breadboard or similar by plugging wires into the female header. An alternative is to solder on a straight male six terminal header and plug the unit into a solerless breadboard.

  Note that the package includes the assembled USB board, a six foot USB type A male to Mini male cable, two six terminal female headers and a straight six term male header.

  FTDI Driver for FT232R

  As noted, I have programmed the FT232R for inverted TX and RX. (Idle is near GRD). If you later desire to program as true TTL (idle near +5 VDC) for some appication, use FT_PROG.

  During the 2010 summer I will be introducing a redesign of the USB BUB Board. In this application, it is functionally the same.

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• PICAXE USB Protoboard. This is all the hardware you need to get started with the PICAXE.

  Powered by a USB Port. Package includes the 830 point solderless breadboard, the USB board and associated mini USB cable (6 feet), the PICAXE of your choice, the LEDs as shown and a bundle of 22 awg solid wire. This is fully assembled with the PICAXE running a flashing light program.

  Note that the above shows a PICAXE-20X2. The Green LED is montoring +5 VDC power supplied by the USB Port and the red LED hanging off the PICAXE is flashing. The USB Board is providing the +5 VDC and also the serial interface.

  Note that you can easily modify this to interface with any PICAXE.

  with PICAXE	Price	-
  PICAXE-08M2	$28.95
  PICAXE-14M2	$29.95
  PICAXE-18M2	$29.95
  PICAXE-20M2	$29.95
  PICAXE-28X2	$36.95
  PICAXE-40X2	$36.95	---

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• Kiwi Patch Board

  

  Four Digit 7-seg LED Display Module Upper LED is Red, Lower is Green. I2C address is 30. Jumper type connector. $14.95. Out of stock.

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• Serial Port Extension Cable, DB9F to DB9M, Six Foot, All nine conductors connected through. Beige - $5.49.

SR04 Ultrasonic Range Finder, Note that I include the mating plug assembly with leads about one foot long. Out of stock. There are many of these on eBay. Search on SR04.

• Serial LCD Controller Kit LCD #117-2400, primarily for the PICAXE. Does not include an LCD. $4.95

• Logic Monitor Kit - $2.49

• 7805 Regulator Kit. Includes 7805 in a TO-220 package, heatsink, screw and nut, diode, two 47 uFd caps and power on LED, lengths of 22 solid AWG red and black wire and diagram. Use with salvaged DC wall power unit in the range of 8 to 12 VDC - $2.49

• 78L05 Low Power 5 VDC Regulator. TO92. 100 mA. $0.50

  

  Wall Power Unit, 120 VAC, Output is nominally 9VDC @ 300 mA. Use with 7805 regulator kit, KIWI patch board, etc. Not for direct use with items requiring +5 VDC. I have terminated with 22 awg solid wire to easily interface with the KIWI or with a solderless breadboard. $7.95

• LED, T1-1/4, Red, 5V. These have built in series limiting resistors eliminating the need for an external 330 Ohm resistor - ten / $2.50

• Four digit 7-seg LED (0.3 inches) Kit. Includes MAX7219CNG and four Ligitek LSD3211-11 (MAN74) common cathode 7-seg LED displays with a right hand decimal point, schematics and 22 awg wire suitable assembly on a solderless breadboard. $12.95

• Four digit 7-seg LED (0.8 inches) Kit. Includes MAX7219CNG and four LSD8151-10 common cathode 7-seg LED displays with a left hand decimal point, schematics and 22 awg wire suitable assembly on a solderless breadboard. $14.95

• MAX7219CNG, Maxim, 8-digit LED Driver, 24-term skinny DIP - $7.95

• ULN2803A Octal Driver, DIP - (Use with CHI-030 Board) $0.75

• L293D Quad Push Pull Drivers - (Use with CHI-035 Board) $2.25

• Use of a Microchip TC4469 Quad FET Driver to Control a Bipolar Stepper

• Microchip TC4469CPD Quad MOSFET Driver $3.95

  Unipolar Stepper Motor, Fuji SMS40-2401-A, 12 VDC, 70 Ohm Coil This may be used as a BiPolar Stepper by not connecting the center taps. $3.95

• QRD1114 Reflective Object Sensor - Out of stock.

• AHT11 Relative Humidity & Temperature Unit $9.95 Sorry. Out of stock. (Feb 11, '12. On eBay there is an AMT1001 which appears to be the same as the AHT11. I have used eBay to order some myself and may offer them.
  Honeywell HIH-4000-001 Relative Humidity Sensor. Discussion. Note that HIH-4000 has replaced the HIH-3610 refered to in my discussion. $13.95

  

• Dallas DS18B20 in Stainless Steel Shroud (1-1/2 in. long). Cable is 1 meter long with solder tipped leads (Yellow, Red, Black). This is often billed as "Waterproof" but I have my doubts over any length of time. Certainly good for outdoor applications. $6.95.

• Dallas DS18B20 Temperature Sensor (TO92 package) - $3.75.

• DS18B20 (TO92) with Connector DS18B20 plus three hole connector on 0.1 inch centers as shown. Leads are about six inches long. - $5.25.

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• LM34DZ (TO92) Temperature Sensor (Degs F) - $2.00

• Microchip MCP9701-E/TO, Linear Active Thermistor, TO-92, (Discussion) - $0.95.

• Microchip MCP1525-I/TO 2.5 V Reference, TO-92 - $2.95. (Out of stock).

• NTC thermistor 2322 640 63103, 10K, Radial lead, (Discussion) - $1.00.

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• Hall Effect Sensor - A3144EUA. - $1.00

• Microchip MCP3424-E/SL4-ch, 18-bit A/D. I have soldered these on SOIC to 14-term DIP adaptor. $9.95.

• Microchip MCP3202-CI/P, 12-bit A/D, SPI, 2-Ch, 12-bit (Sample Routine) - $2.95

• Microchip MCP3208-CI/P, 12-bit A/D, SPI, 8-Ch, 12-bit - $3.95

• Microchip MCP609-I/P, Quad Op Amp, Rail to Rail, 14-pin DIP - $1.85

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• DS1302, RTC, 8-pin DIP with 32.768 kHz crystal - $3.50

• DS1307, RTC, 8-pin DIP with 32.768 kHz crystal - $3.50.

• SGThompson 24C32, 4K X 8 EEPROM, functionally the same as the 24LC256 except 4K vs 32K bytes) - $0.50

• Microchip 24LC256, 32K X 8 EEPROM. - $2.00.

• Infrared Kit. See discussion. Includes a T1-3/4 IR LED, TIP41C NPN transistor, 38 kHz Sony IR three terminal receiver and drawings. - $5.95.

• Universal TV Remote Control. May quickly be configured as a Sony. - $9.95

• External Infrared Transmitter, 38, 40 and 56 kHz - $3.00

• Kobitone Piezo. May be used in place of a speaker for tones and playing tunes. $1.95.

• Speaker, 2.0 inch diameter, 0.93 in depth, 100 Ohm, 0.2Watt. Use with series 47 uFd capacitor. Capacitor included. $1.95.

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• Resonators, three terminal, internal capacitors.

  ECS # / Freq	Price	-
  ZTT-4.0MG / 4.0 MHz	$0.95
  ZTT-8.00MT / 8.0 MHz	$0.95
  ZTT-16.0MX / 16.0 MHz	$0.95

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• Audio Jack - 3.5 mm. This is the jack used by Rev-Ed. $0.50

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• DIP sockets, soldertail, tin. All are 0.3 inch wide except 40 term is 0.6 inches.

  

  Num of Pins	Price	-
  8	$1.00 / 5
  14	$1.00 / 5
  18	$1.00 / 4
  20	$1.00 / 3
  28	$1.00 / 2
  40	$2.00 / 3

• DIP sockets, soldertail, tin. These are 0.6 inches wide.

  Num of Pins	Price	-
  24	$1.00 / 3
  28	$1.00 / 3

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• Electrolytic Capacitor, 1.0 uF, 50 VDC, Radial Leads, $0.95 / 20.

• Electrolytic Capacitor, 10 uF, 50 VDC, Radial Leads, $0.95 / 15.

• Electrolytic Capacitor, 22 uF, 50 VDC, Radial Leads, $0.95 / 15.

• Electrolytic Capacitor, 47 uF, 50 VDC, Radial Leads, $0.95 / 10.
• Electrolytic Capacitor, 100 uF, 16 VDC, Radial Leads, $0.95 / 10.

• Electrolytic Capacitor, 220 uF, 25 VDC, Radial Leads, $0.95 / 5.

• 1N4004 Diode, 400 VDC, DO-41 - $0.95 / 10

• BAT42 Schottky Diode, DO-35, Axial Leads - $1.49 / 10

• Keystone 1902C, hex threaded standoff, 0.5 length X 0.25 wide, nylon, with #4-32 X 1/4 slotted screw. For printed circuit boards. $1.95. (Four spacers and screws).

  

• Terminal Block, OST ED120/2DS, Vert, 2-pos, 0.2 inch spacing. These may be snapped together as shown. Ideal for the CHI030 and CHI035 boards. $1.95 (Four terminal blocks). Out of stock.

• Terminal Block, On-Shore ED120/3DS Vert, 3-pos, 0.2 spacing. These may be snapped together. $2.95 (Four terminal blocks).