voice keychain:
Ningbo AST Industry Co.,Ltd has 17 Years Experiences to produce the Voice Keychain,musical
keychains,keychains,led keychains and so on.we can assure you of
competive price,high quality,prompt delivery and technology supporting.
The Voice Keychains are usually used for Celebration,Promotion,Birthday,Holiday,Award Ceremony and so on.
2. Classification:
There are Recordable keychain and Musical keychain
USA, UK,Canada,Germany, Turkey,Russia,Poland,Switzerland,Netherland
,Frence Hungary ,Australia,New Zealand, Brazil,
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1. Voice Keychain Application:
Recordable keychain--we can record our own message and playback it
Music Keychain--The audios will be customized.The clients provide
the audios,the we programme the audio into the voice keychain.then it
will play the customized audio
3.Sound Quality:Clearly and Loudly
4.Play activated:Press the play button to play the message
5.Can be printed your logo on it
6.Certification:CE ,Rohs
7.Export to:
Design of a new EEG monitoring TCI syringe pump based on M3352 industrial control core board
**1.1 Background Event**
During surgical procedures, administering anesthesia beyond the recommended dosage can lead to serious complications like cardiac and respiratory arrest, potentially causing irreversible brain damage. Traditionally, anesthesiologists relied solely on their experience to manage the dosage. However, the advent of the EEG monitoring TCI injection pump has revolutionized this process. By integrating BIS (electroencephalogram monitoring) with TCI (target-controlled infusion), this innovative device provides a personalized approach to sedation, significantly reducing the risks associated with anesthesia.
**1.2 EEG Monitoring TCI Syringe Pump Control Board Functional Requirements**
Building upon traditional syringe pumps, the EEG monitoring TCI syringe pump incorporates data from the EEG analyzer to determine the precise amount and rate of drug delivery. This makes the injection process more scientific and secure. The control board's primary functions include:
- **Display Interface**: A 7-inch or larger true-color LCD display with touchscreen capability.
- **RS-232 Interface**: Connects to the EEG analyzer for real-time data exchange.
- **PWM Output**: Controls the injection motor for accurate dosing.
- **ADC Input**: Collects position data from the injection tubing.
- **Sound Card**: Provides audible feedback during the injection process.
- **Ethernet Connectivity**: Facilitates data upload to a central server for remote monitoring.
**1.3 Challenges in Designing the EEG Monitoring TCI Syringe Pump Control Board**
Despite its potential benefits, designing such a device presented several challenges:
1. **Touchscreen 'Flying Points' and Frequent Errors**
The four-wire resistive touchscreen often exhibited erratic behavior, leading to incorrect operations. Observations revealed noticeable interference in the form of 'bursts' and 'waves' during touch input, as illustrated in Figure 1.
*Figure 1: Touchscreen Operation Line*
2. **Slow Response and Occasional System Crashes**
Given the complexity of the internal processes and the multitude of software tasks, the system's responsiveness was sluggish. Occasionally, the system would crash, necessitating a reboot.
3. **Unreliable Power-off Restart**
When the device was shut down abruptly, it occasionally failed to start correctly. This issue was traced back to the loss of the operating system's file system after power loss. This problem manifested across multiple prototype units, significantly impacting product reliability.
**1.4 Our Solution**
In response to these challenges, ZLG Zhiyuan Electronics proposed the M3352 industrial control core board to expedite product development. The project's block diagram is depicted in Figure 2.
*Figure 2: Project Block Diagram*
1. **Addressing the 'Flying Point' Issue**
To counteract the touchscreen's erratic behavior, we implemented both hardware filtering and enhanced software algorithms. The circuit schematic, shown in Figure 3, includes a low-pass filter with capacitors (C78-C81) set at 1nF to mitigate interference.
*Figure 3: Touchscreen Circuit*
After optimization, the touch response became smoother, as demonstrated in Figure 4.
*Figure 4: Improved Touchscreen Response*
2. **Enhancing Performance with Industrial Control Core Board**
The sluggish performance and occasional crashes were attributed to insufficient processor power. The M3352 core board, equipped with a Cortex-A8 processor running at 800 MHz, offers over four times the performance of standard ARM9 processors. Furthermore, the core board underwent rigorous stress testing, ensuring stability across various sectors, including healthcare, energy, and defense.
3. **Ensuring Reliable File Systems**
Repeated power-off restart failures were traced to file system corruption. To address this, we conducted extensive testing on the M3352 core board, confirming that the file system remained intact even after 100,000 power cycles.
**1.5 Recommended Products**
The M3352 core board, designed to meet industrial standards, demonstrates robustness under extreme conditions. Its key features include:
- TI Cortex-A8 AM3352 processor, 800 MHz clock speed
- Compatibility with Windows CE and Linux operating systems
- Six UART interfaces
- Two CAN interfaces
- Dual USB OTG ports (480 Mbps)
- Dual Ethernet ports (one Gigabit)
- Compact size: 60mm x 45mm
- Operating temperature range: -40°C to +85°C
This board not only addresses the technical hurdles but also ensures the highest level of reliability and performance for advanced medical devices like the EEG monitoring TCI syringe pump.