The Talking Compass Circuit
The talking compass system operates by utilizing the Hall-effect direction sensor, which detects the Earth's magnetic field to determine the compass heading. The MODI sensor outputs digital signals corresponding to the direction the compass is facing. This information is processed and used to trigger the appropriate audio announcement stored in the ISD1016 device.
The ISD1016 is an analog storage device capable of recording and playing back audio. It allows for the programming of up to eight distinct audio messages, each lasting two seconds, which correspond to the eight primary compass directions: North, Northeast, East, Southeast, South, Southwest, West, and Northwest. The audio messages can be recorded and programmed by the user, enabling customization of the compass announcements.
The 74S188 preprogrammed PROM serves as a memory component that stores the audio message addresses and controls the playback sequence. This PROM is integral to the operation of the talking compass, as it ensures that the correct audio message is played back in response to the directional input from the MODI sensor.
Additional components in the circuit may include resistors, capacitors, and power supply elements that support the operation of the Hall-effect sensor, audio storage device, and PROM. The entire assembly is typically housed in a compact enclosure, allowing for portability and ease of use in various outdoor navigation applications. This talking compass is particularly beneficial for visually impaired users, providing auditory direction cues to enhance navigation. A talking compass is made up using a Hall-effect direction sensor (MODI) and an ISD1016 analog audio storage device. It is possible to program eight two-second announcements, for each of the eight main compass directions.
The Talking Compass is comprised of a digital compass (MODI), and ISD1016 analog storage device (U2), a 74S188 preprogrammed PROM (U3), and a handful of additional components.
Related Circuits
Similar to the initial two Hijack Alarms, this circuit is designed to activate if a door is opened while the ignition is switched on. After a delay of several minutes, allowing the thief to move a safe distance away,...
The circuit diagram for the bridge integrated pressure signal conditioner MAX1450 is composed of various components. The MAX1450 is a high-performance integrated circuit designed for signal conditioning in pressure sensing applications. It is particularly suited for use with resistive bridge...
The humidity/frequency conversion circuit operates similarly to the previously mentioned humidity sensors. At a humidity level of 76%, the equivalent capacitance is 500 pF, with a capacitive relative humidity variation rate of +1.7 pF/%. The circuit includes an integrating...
A simple instrumentation amplifier circuit diagram utilizing an operational amplifier (op-amp). The equation for gain, along with design, working principles, and construction details, are also provided. An instrumentation amplifier is a type of differential amplifier that has been designed to...
This simple circuit can monitor the overflow of water from the overhead tank. The sensor placed close to the lid of the overhead tank continuously monitors the presence of water. The described circuit functions as a water overflow monitoring system...
An AC mains operated single LED flasher circuit is constructed using the widely utilized CMOS timer chip TLC555. The entire circuit is powered directly from the 230VAC grid supply via a capacitive potential divider and associated components. This compact...