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HA7S ASCII to 1-Wire Host Adapter
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The ASCII to 1-Wire host adapter from Point Six, Inc. is a very powerful special-purpose chip. The HA7S is a TTL to 1-Wire interface in a very small 6-pin SIP designed to provide an ASCII command set for embedded controller and battery-operated applications that need to accommodate Dallas Semiconductor iButton and 1-Wire devices. The HA7S provides support for all 1-Wire devices using a serial protocol. Block mode commands support all 1-Wire device functions. The HA7S relieves the host of the burden of generating the time-critical 1-Wire communication waveforms while supporting all 1-Wire devices with simple ASCII commands that can be easily generated. The HA7S does all the hard work of interfacing 1-Wire networks.
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Figure 3-9 SN7516 differential bus transceiver.
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Small size and very low power consumption as well automatic power-up and power-down features allow the HA7S to operate in low-power and battery-operated applications with no need for power control signals from the host device. The only interface signal required is the TTL-level TX and RX from a UART or microprocessor. The HA7S powers up into a very low power state. When a serial ASCII command is sent, the HA7S will wake up, process the command, send the response, and power itself down. The 1-Wire bus can be left in a powered-up or a powered-down state while the HA7S is powered down. While in powerdown mode, the HA7S has a very low quiescent current requirement of about 5 A. The HA7S can perform search and family search functions, making it easy to acquire the unique 64-bit serial numbers of all connected devices. Many sensor devices require that extra power be delivered during periods of data conversion (DS1920 and DS1820 temperature sensors, for example). The HA7S automatically provides the extra current these devices require with a built-in smart strong pull-up. Dallas Semiconductor iButtons, which store data in TMEX touch memory file format, can be read or written with simple ASCII commands. The HA7S will automatically generate and check the CRC16 error checks from touch memory file records. The HA7S supports analog, digital, and temperature 1Wire devices and all Dallas Semiconductor iButtons. The HA7S communicates at 9600 baud, 8 bits, no parity, and 1 stop bit.
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Eight-Channel Infrared Remote Control System
The diagrams in Figs. 3-10 and 3-11 illustrate an eight-channel infrared remote transmitter and receiver system for remote control. This powerful remote control system can be used to control robots or devices around your home and office and can be readily interfaced with the STAMP 2 processor. The eight-channel IR transmitter is centered around a specialty PIC at U1; this processor is designed to act as a carrier wave generator that generates a 38- or 40-kHz constant carrier wave signal, which activates driver transistor Q1, shown in Fig. 3-10. Transistor Q1
2 2 header
1 3 2 4
38 40-kHz SELECT
On/Off +5V 74HC132 330 5.1 Q1 2N4403
+5V 0.1 F 4MHz XTL
1 2 8 VSS 7 GP0 6 3 GP4 OSC2 GP1 5 4 GP5 MCLR CPZ/TOCK VDD U1 GP4 OSC1
38 40-kHz carrier
PIC12C508-04/P VCC
D0 D1 D2 D3 D4 D5 D6 D7 N/O
D1 D3 D4 390K D5 D6 D7 D8 D9 D10
24 11 10 23 1 2 3 4 5 6 7 8
A0 VCC OSC2 A1 OSC1 A2 A3 D0 A4 D1 A5 D2 D3 A6 A7 D4 A8 D5 A9 D6 TE D7 Dout GND
13 14 15 16 17 18 19 20 21 22 9 12
IR LED
IR LED
HT640
D11 D12 D13 D14 D15 D16 D17 D18
All diodes IN914
Figure 3-10 Eight-channel IR remote transmitter.
+V U1 +V 38kHz IR module IR sensor SEN 2N2222 +5V PNA-4602M 10K
13 14 15 16 17 18 19 20 21 22 9 12 24 VCC 11 A0 A1 OSC2 10 A2 OSC1 D0 23 A3 D1 1 A4 D2 2 A5 D3 3 A6 A7 D4 4 D5 5 A8 A9 D6 6 D7 7 Din GND VT 8
S1 R3 390K R4 10K
IN914
D2 +5V RY2
2N2222 Q4
HT.648L LED R2 330 D1 Q2 2N2222
R1 10K
D3 +5V R6 Q5 RY3
+V D4 +5V RY7 D8 Q9 RY8 D9 Q10 RY6 +5V
D5 Q7 D6 +5V +5V RY5
R11 +5V D7 Q8 +5V R9 R8
Figure 3-11 Eight-channel IR remote receiver.
50 SERIAL BUILDING BLOCKS
drives both IR LED 1 and IR LED 2, which act as IR transmitters. When no jumpers are programmed at the header i.e., the default condition exists as shown then a 38-kHz carrier is generated. The HT-640 encoder sends a 4-word transmission cycle upon receipt of a transmission enable signal, i.e., a low signal at pin 9. The Holtek HT-640 digital encoder is an 8-channel input device with an 8-bit address programming. In operation, both transmitter and receiver addresses must be set exactly the same for the system to work. The output from the Holtek HT-640 encoder, in effect, modulates the 38-kHz carrier wave when it is combined with the signal from the carrier wave generator at U3. The IR remote control transmitter circuit is powered from a 5-Vdc regulator, such as an LM7805. Once the transmitter is built, an address is programmed into the encoder by grounding the address pins. In operation, once the receiver is set with the same programming configuration you are ready to remotely control devices. Pressing D0 on the transmitter encoder activates the D0 output on the corresponding receiver/decoder. Pressing D1 on the transmitter s encoder will thus produce an output at receiver/decoder s output D1. This remote control system is ideal for robotics and model railroad applications. The corresponding 8-channel IR receiver/decoder is shown in Fig. 3-11. A 38-kHz PNA-4602M IR module from Rentron was used for the IR detector. The 3-pin device produces a demodulated serial data signal at its output. The IR detector is powered by 5 V as , is the HT-648L decoder. The output from the IR detector is coupled via a 10-k resistor to Q1. Transistor Q1 drives the Holtek HT-648L decoder IC, on pin 14. A system status indicator LED is driven by transistor Q2 at pin 17. The decoder outputs on pins 10 through 13 are used to drive the four 5-V relays. Each decoder output is driven by a 2N2222 transistor, which in turn activates a relay when the correct output is selected at the remote encoder IC. Silicon diodes are used for protection at each of the relays to protect the transistors. In operation, as noted, the HT-1648L decoder addresses must be programmed by jumpering the address pins to ground. The address coding must be the same for the transmitter and corresponding decoder setup. This address coding scheme (Listing 3-1) allows many different encoders and decoders to operate in the same space and not disturb or interfere with each other. Complex system schemes can be developed with no interference between systems. Also note that the Holtek encoder/decoder series works well with small RF transmitters and receivers for remote control applications. The Holtek encoders/decoders make constructing remote control systems quite simple!
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