User Manual. UIS1200 Series Micro Capacitive Sensor Controller

Transcription

1 User Manual Series

2 C/D Please pay attention to the following before using the UIROBOT products: UIROBOT products meet the specification contained in their particular Data Sheet. UIROBOT will only work with the customer who respects the Intellectual Property (IP) protection. Attempts to break UIROBOT s IP protection feature may be a violation of the local Copyright Acts. If such acts lead to unauthorized access to UIROBOT s IP work, UIROBOT has a right to sue for relief under that Act. Information contained in this publication regarding controller applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. UIROBOT MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. UIROBOT disclaims all liability arising from this information and its use. Use of UIROBOT products in life support and/or safety applications is entirely at the buyer s risk, and the buyer agrees to defend, indemnify and hold harmless UIROBOT from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any UIROBOT intellectual property rights. [Trade Mark/ Layout-design/Patent] The UIROBOT name and logo are registered trademarks of UIROBOT Ltd. in the P.R. China and other countries. UIROBOT s UIM24XXX series Step Motor Controllers, UIM25XX series CAN-RS232 Converter and their layout designs are patent protected. [Contact] SHANGHAI UNITED INTELLIGENCE ROBOTICS INC. ADD : Rm , Building Y2, No, 112 Liang Xiu Rd, Zhangjiang Innopark,Shanghai,China Z I P : T E L : (sales,Marketing) F A X: N E T: info@uirobot.com [ Ordering Information ] In order to serve you quicker and better, when you order series controller, please provide the product number in following format. PART NUMBERING SYSTEM UIS Category UIS Sensor Series 1200 Capacitive Output C = UART communication output D = Digital output PAGE 2 S EN UI Robot Technology Co. Ltd

3 FEATURES Miniature size: 17mm*27mm*4mm(without connector, bond wire to control terminal) 17mm*27mm*6mm(2*5 connector, 2mm) Range and Precision Automatic Adjust Multiple Digital Output UART Communication Output Minimum Capacitance Detection less than 1pf DESCRIPTION is a micro capacitive sensor detection controller. It is cost-effective, and simply installed. can convert the feedback of capacitive sensor (such as liquid detection, proximity switch) to digital output by creating excitation wave. can detect a capacitive value variation less than 1pf. It adopts intelligent adaptive control, can adjust measuring range and sensitivity according to capacitive sensor connected and current situation automatically, and then get the best detection precision. Furthermore, the included precision potentiometer can make further adjustment. has a compact size at 17mm 27mm. The metallic shield offers protection against electrical field disturbances, and mechanical protection for internal chip. It can connect to capacitive sensor by welding directly, or via a coax connector (Refer to appendix B). UI Robot Technology Co. Ltd. S EN PAGE 3

4 C/D TERMINAL DESCRIPTION Figure0-1: Wiring Terminal Control Terminals POT A Signal Terminals A Control Terminals Terminal No. Designator Description 1 Supply voltage, DC 2 Supply voltage ground 3 4 Sending terminal of UART, only for -C(future product) Receiving terminal of UART, only for -C(future product) 5 ~ Digital outputs, only for -D 6 Enable the controller Signal Terminals Designator A Description Signal input, connect to one terminal of the detective capacitance Analog ground, connect to the other terminal of the detective capacitance Note: Voltage on port must be lower than 3.3V, otherwise, the controller will be damaged. PAGE 4 S EN UI Robot Technology Co. Ltd

5 TYPICAL APPLICATION controller s wiring is shown in following figure. User only needs to connect the capacitive sensor to the controller. can be used in following appilication: Needle liquid level detection, Container liquid level detection and Capacitance value detection. Note: In order to avoid the external interference in the signal transmission process, please use coaxial cable to connect sensor and controller, if user do not want to use a coaxial cable, please make sure that the sensor and the controller be close. Probe needle liquid level detection In needle liquid level detection application, needle (made by conducting material) should be connected to terminal, and the pedestal of container (or rack, or any conducting object near the container) should be connected to A terminal. Figure0-2: Wiring Scheme for Probe Needle Liquid Level Detection Needle liquid level detection A A WARNING: Voltage on port must be lower than 3.3V, otherwise, the controller will be damaged. UI Robot Technology Co. Ltd. S EN PAGE 5

6 C/D Container liquid level detection In container liquid level detection application, the two contact rods covered by insulating barrier should be connected to and A terminal respectively. Figure0-3: Wiring Scheme for Container Liquid Level Detection Coaxial cable core Coaxial cable shielding layer coaxial-cable A A Container liquid level detection WARNING: Voltage on port must be lower than 3.3V, otherwise, the controller will be damaged. PAGE 6 S EN UI Robot Technology Co. Ltd

7 Capacitance value detection In capacitance value detection application, the conductive body of detected capacitance should be connected to and A terminal respectively. Figure0-4: capacitance value detection Coaxial cable core Coaxial cable shielding layer A coaxial-cable A C Capacitance value detection WARNING: Voltage on port must be lower than 3.3V, otherwise, the controller will be damaged. UI Robot Technology Co. Ltd. S EN PAGE 7

8 C/D DIGITAL OUTPUT -D compares the voltage value of POT and the capacitance value detected, and then according to the result, the LED on port - will be on or off (Table 0-3). Since -D adopts OC, when one LED is light, the corresponding port will be grounded. (Figure 0-5) Digital Output Circuit The inner drive of UIS 1200-D adopts OC (Figure 0-5). When the dynatron is open, the voltage of Dn will be, and the corresponding LED will be off. When the dynatron is connected, the voltage of Dn will be 0V, and the corresponding LED will be light. Users can get the variation of the capacitance value via the status of those LEDs. The drive capability (absorption current) of Dn ports is no less than 50mA. Figure0-5: digital output circuit Dn(n=1~5) μc WORKING PRINCIPLE and LOGIC -D has an embedded high-performance DSP. It can convert the variation of capacitive to corresponding voltage, and show the result via LED or OC port. The logic between status of Dn and LED is shown in Figure 0-6. PAGE 8 S EN UI Robot Technology Co. Ltd

9 Figure0-6: Logic between status of Dn and LED Capacitance value TH TH threshold1 TH threshold2 TH POT adjust 0 Time -TH -TH Define the variation of capacitive as ΔCin, then the logic between ΔCin and status of LED is as follow: Table0-3: Logic between ΔCin and status of LED ΔCin LED state -TH < ΔCin <TH LED on is light TH < ΔCin <TH LED on, is light TH < ΔCin < + -TH < ΔCin < -TH LED on, is light - < ΔCin < -TH LED on,, is light, which denotes capacitive value increasing LED on,, is light, which denotes capacitive value decreasing Note:User can set TH by adjusting POT. According to TH, the controller sets TH automatically, user can not alter it. POT Adjust Process Take needle liquid level detection for example, the following section will describe the steps of setting the threshold by adjusting POT. Once -D is power on, it will automatically calibrate zero level. Then the LED on will be light, which means the environment capacitance value (such as the capacitance value between the needle adapter and the current-carrying plate on left) is set to zero. UI Robot Technology Co. Ltd. S EN PAGE 9

10 C/D Figure0-7: automatic zero setting Needle adapter current-carrying plate or rack Container of liquid A A PAGE 10 S EN UI Robot Technology Co. Ltd

11 Adjust POT to achieve follow status: once the needle is plugged in (capacitance value will increase several pf), LED on will be light, once the needle is pulled, LED on will be off. Define the capacitance value at this status as TH. Once TH is set, the needle is on or not can be simply detected via the status of LED on. Figure0-8: Adjust POT Needle A A Once TH is set, TH will automatically be set by according to TH. Once the needle head contacts with liquid, the capacitive value will rise sharply, and go over TH, then LED on will be light, the output of will be grounded. Figure0-9: Adjust POT A A The principle of capacitance value decrease detection is similar to the above process. UI Robot Technology Co. Ltd. S EN PAGE 11

12 C/D URAT COMMUNICATION OUTPUT -C is a kind of future product, there is no detail description in this document. CHARACTERISTICS Supply Power Voltage Output Voltage Output gear Output Mode Detection Precision Detection Range Response Frequency 4V 5.DC 0/4V-5.DC(operating voltage) or OC 5 grade Digital Voltage Level or UART Communication 1pf Auto Adjust 1KHz PAGE 12 S EN UI Robot Technology Co. Ltd

13 APPENDIX A DIMENSIONS Unit: mm UI Robot Technology Co. Ltd. S EN PAGE 13